short essay about dinosaurs

Dinosaurs gambol and charge through our imagination as scaly reptilian creatures with menacing teeth, claws, spikes, and hammering, bony bulbs. They roamed Earth roughly 175 million years ago, and most were wiped out by an extinction event roughly 65 million years ago. Thanks to ongoing scientific research, we continue to revise our theories about how dinosaurs evolved, what they ate, and how they moved through their environments. Read about the latest discovery in National Geographic’s Science article: Bizarre Spinosaurus Makes History as First Known Swimming Dinosaur.

Biology, Earth Science, Geology

Essay on Dinosaur

Students are often asked to write an essay on Dinosaur in their schools and colleges. And if you’re also looking for the same, we have created 100-word, 250-word, and 500-word essays on the topic.

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100 Words Essay on Dinosaur

What are dinosaurs.

Dinosaurs are a group of reptiles that appeared during the Mesozoic Era, between 230 and 65 million years ago. They were the dominant terrestrial vertebrates for over 160 million years.

Types of Dinosaurs

Dinosaurs are classified into two types based on their hip structure: Saurischia, including creatures like T-Rex, and Ornithischia, like Triceratops.

Dinosaur Extinction

Dinosaurs became extinct about 65 million years ago. Scientists believe a large asteroid hitting Earth caused their extinction.

Dinosaurs and Birds

Recent discoveries suggest some dinosaurs evolved into birds, making birds the only surviving dinosaurs today.

250 Words Essay on Dinosaur

Introduction.

Dinosaurs, the colossal creatures that once roamed our planet, continue to intrigue scientists and the public alike. These reptiles, which first appeared during the Mesozoic Era, around 230 million years ago, were the dominant terrestrial vertebrates for over 160 million years.

The Classification of Dinosaurs

Dinosaurs are broadly classified into two orders: Ornithischia, the bird-hipped dinosaurs, and Saurischia, the lizard-hipped dinosaurs. This classification is based on their hip structures. Interestingly, it’s the lizard-hipped dinosaurs that are believed to have given rise to birds, not the bird-hipped dinosaurs.

Size and Adaptations

Dinosaurs exhibited a remarkable range in size, from the tiny Microraptor to the massive Argentinosaurus. Their physical adaptations, such as bipedalism or quadrupedalism, sharp teeth or beaks, and armoured scales or feathers, were aligned with their diverse habitats and diets.

Extinction and Legacy

The mass extinction event at the end of the Cretaceous Period, about 66 million years ago, wiped out all non-avian dinosaurs. The cause is widely believed to be a catastrophic asteroid impact, although volcanic activity may also have played a role. Today, their legacy lives on through their closest living relatives, the birds.

The study of dinosaurs provides invaluable insights into evolutionary biology, paleoecology, and Earth’s history. As we continue to unearth new fossils and apply advanced techniques, our understanding of these magnificent beasts and their ancient world will only deepen.

500 Words Essay on Dinosaur

Introduction to dinosaurs.

Dinosaurs, the colossal creatures that once roamed the Earth, continue to captivate our imaginations. These prehistoric beasts, whose name translates to “terrible lizards” in Greek, dominated terrestrial ecosystems for over 160 million years, only to suddenly vanish in a mass extinction event.

The Era of Dinosaurs

Dinosaurs first appeared during the Mesozoic Era, which is further divided into three periods: the Triassic, Jurassic, and Cretaceous periods. The Triassic period marked the dawn of the dinosaur age, with the first dinosaurs being small, bipedal creatures. By the Jurassic period, dinosaurs had diversified into a wide array of forms, from the long-necked, plant-eating Sauropodomorphs to the sharp-toothed, carnivorous Theropods. The Cretaceous period saw the emergence of some of the most famous dinosaurs, like Tyrannosaurus Rex and Triceratops.

Dinosaur Classification

Dinosaurs are classified into two main orders based on hip structure: Saurischia and Ornithischia. Saurischians include the carnivorous Theropods and herbivorous Sauropodomorphs, while Ornithischians were exclusively herbivores. Interestingly, birds descended from a group of two-legged dinosaurs known as theropods, the members of which include the powerful predator T. Rex and the smaller Velociraptors.

The end of the Cretaceous period, around 66 million years ago, marked the end of the dinosaur era. A mass extinction event, often attributed to a catastrophic asteroid impact, led to the demise of about 75% of all species on Earth, including most dinosaurs. However, the lineage of theropods survived and evolved into today’s birds.

Dinosaurs and Paleontology

Paleontology, the study of ancient life, has greatly expanded our understanding of dinosaurs. Fossil evidence reveals details about dinosaur anatomy, behavior, and evolution. For instance, discoveries of dinosaur nests suggest that some species exhibited parental care. Fossilized feathers on theropods support the theory that birds are modern dinosaurs.

Dinosaurs represent a fascinating chapter in Earth’s history. Their diversity, dominance, and extinction provide valuable insights into evolutionary biology and Earth’s geological past. As ongoing research continues to unearth new discoveries, our understanding of these magnificent creatures continues to evolve, reminding us of the dynamic and ever-changing nature of life on Earth.

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Essay on Dinosaurs for Children

May 22, 2018 by Manasi Shewale Leave a Comment

DINOSAUR: THE EXTINCT PREDATOR REPTILE

The term “Dinosaur” was given by Sir Richard Owen in the year 1841 – 1842. This word is derived from the Greek language and it has the meaning of a terrifying lizard.

We all know that dinosaur was the ultimate predator known to the man kind which lived in the Triassic and Jurassic Period of the Mesozoic Era. This period was almost 241 million years ago on the Earth and during this period, the dinosaurs were the most dominant species found on the Earth and therefore, the ultimate predator.

Mesozoic Era of the geological time scale is often known as the Age of Reptiles. During this period, there were many reptilian species living on this planet in abundance. Among these reptilian species was the group of Dinosaurs. A group or clade (Dinosauria) of dinosaur involves different species of dinosaur.

It is clear that dinosaurs lived on the Earth 247 – 241 million years ago and they lived for more than 175 million years on this planet. Out of these 175 million years, dinosaurs were living as the dominant species for almost 135 million years.

After a certain period of time, that is in the Cretaceous Period of the Mesozoic Era, these dinosaurs became extinct. The reason behind this is still not known due to inadequate evidence present to support the respective theories.

It is usually said that birds are the descendants of dinosaurs as the birds are evolved from the reptiles that is dinosaurs. The evidence of birds evolving from reptiles is the connecting link Archaeopteryx.

Archaeopteryx is an animal which has wings with claws and many such features which belong to birds and reptiles respectively.

Birds have evolved from this connecting link therefore, birds can be called as living dinosaurs and therefore, proving that dinosaurs are not totally extinct. It also indicates that only the huge, reptilian dinosaurs have become extinct due to their inadequacy to adapt to the changing environment.

There were different types of dinosaurs which varied according to their shape, size and morphological features. Some dinosaurs were huge (100 feet long and 50 feet tall) and some were small (equal to the size of a turkey).

Also, the dinosaurs can be classified based on their diet that is some are carnivores (meat eating dinosaurs) and some are herbivores (plant eating dinosaurs). The meat eating dinosaurs also used to feed on the smaller dinosaurs if no other animals were available around them.

There were also some dinosaurs who walked on 2 legs whereas some dinosaurs walked on 4 legs and there were some dinosaurs which could walk on 2 legs as well as 4 legs.

They also had varying shape of the body, for example, some had horns, crests, bony armor, differences in the shape of the hip (reptile-hipped known as Saurischia and bird-hipped known as Ornithischia), etc.

All these factors were varying in different dinosaurs thus, making it a very diverse group of reptiles with similar taxonomic characteristics. The knowledge of dinosaurs is all learnt from the available fossil records.

These fossils are very diverse and therefore, deriving information from these fossils and to categorize the dinosaurs based on the variations found in the fossil records is essential.

Dinosaurs have various characteristic features but certain features are similar, for example, all dinosaurs are oviparous in nature that is, dinosaurs lay eggs and these eggs then hatch into young ones of the dinosaurs, dinosaurs are uricotelic (they excrete uric acid), etc.

During the Jurassic Period that is 200 – 145 million years ago, the dinosaurs were the dominant species on the earth which lead to excessive population of dinosaur species.

And after the Jurassic Period, when the Cretaceous Period began, the dinosaurs became extinct. There are various theories which have suggested the process of extinction of dinosaurs.

During the cretaceous period, there was a mass extinction event which caused the extinction of various species along with the dinosaurs. For example, planktons, brachiopods, etc. they also disappeared along with the non-avian dinosaurs but the fact about dinosaurs declining before the mass extinction event still remains a mystery.

During the mass extinction event, it is believed that there was a rise in the Earth’s or global temperature. There are different theories which explain about the rise of the temperature on the Earth and therefore, why or how the dinosaurs got extinct due to the impact.

The first theory is that of an asteroid hitting the Earth which suggests that there were basalt eruptions and decrease in the sea level which led to increase in temperature along with a comet striking the seabed near the Yucatan Peninsula, Mexico which led to the mass extinction event.

The second theory was of the Volcanic eruption which led to drastic changes in the global temperature thus, blocking the sunlight with debris that disrupted all the photosynthetic systems as well as the food chain.

Now, the scientist came to a conclusion with these two theories was because of the rock which was discovered and was dated back to the extinction event. This rock was rich in Iridium metal which is not that abundant on the earth’s surface but is either found in the asteroid masses or in the volcanic lava.

Therefore, this discovery made the scientists to believe that the mass extinction event was most likely triggered due to a huge volcano or some asteroid.

Nevertheless, there are many such facts which are still unexplained and therefore, the sudden disappearance of the dinosaurs from the Earth is also a mystery.

About Manasi Shewale

Manasi Shewale loves to read novels and review them inturn. She is an avid reader of various topics of scientific interest in Chemistry and Biology.

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A brief history of dinosaurs

Dinosaurs ruled the Earth for about 174 million years. Here's what we know about their history.

What are dinosaurs?

Types of dinosaurs, when did dinosaurs live, what is the largest dinosaur the smallest dinosaur, pterosaurs are not dinosaurs, did dinosaurs have feathers, could dinosaurs fly, why did dinosaurs go extinct, can dinosaurs be brought back, additional resources.

Dinosaurs were a successful group of animals that emerged between 240 million and 230 million years ago and came to rule the world until about 66 million years ago, when a giant asteroid slammed into Earth . During that time, dinosaurs evolved from a group of mostly dog - and horse -size creatures into the most enormous beasts that ever existed on land.

Some meat-eating dinosaurs shrank over time and evolved into birds. So, in that sense, only the non-avian dinosaurs went extinct. (For the purposes of this article, "dinosaurs" will refer to non-avian dinosaurs, unless otherwise stated.)

During the roughly 174 million years that dinosaurs existed, the world changed greatly. When dinosaurs first appeared in the Triassic period (251.9 million to 201.3 million years ago), they roamed the supercontinent of Pangaea . But by the time the asteroid hit at the end of the Cretaceous period (145 million to 66 million years ago), the continents were in approximately the same place they are today.

The oldest unequivocal dinosaur fossils, dating to about 231 million years ago, are from Ischigualasto Provincial Park in northwestern Argentina, and include the genuses Herrerasaurus , Eoraptor and Eodromaeus . Scientists are still debating whether Nyasasaurus , a genus found in Tanzania that dates to about 240 million years ago, is also an early dinosaur or a dinosauromorph, a group that includes dinosaurs and their close relatives, said Steve Brusatte, a paleontologist at the University of Edinburgh in Scotland. 

Related: Photos: Unearthing dinosauromorphs, the ancestors of dinosaurs

Whenever they first appeared, the dinosaurs' unique anatomy set them apart from other animal groups. Dinosaurs are archosaurs, a clade (different groups of animals that share a common ancestor) that includes crocodilians , pterosaurs , dinosaurs and birds. The archosaurs emerged after the end-Permian extinction about 252 million years ago. Over time, some archosaurs, including dinosauromorphs, adapted an upright posture, meaning they had legs under their bodies, rather than out to their sides. 

"Sprawling is all well and good for cold-blooded critters that don't need to move very fast. Tucking your limbs under your body, however, opens up a new world of possibilities," Brusatte wrote in " The Rise and Fall of the Dinosaurs: A New History of a Lost World " (William Morrow, 2018). As archosaur evolution progressed, dinosauromorphs gained long tails, big leg muscles and extra hip bones that enabled them to move quickly and efficiently, Brusatte wrote. 

Some dinosauromorphs evolved into dinosaurs. The differences between the two are small, but dinosaurs' anatomy offered increased benefits, including arms that could move in and out, neck vertebrae that could support stronger muscles than before, and a joint where the thigh bone meets the pelvis, Brusatte wrote.

This unique anatomy helped dinosaurs become successful. Having an upright posture also freed the hands, allowing dinosaurs such as iguanodonts to grasp branches and carnivorous dinosaurs to claw and kill prey, noted Gregory Erickson, a paleobiologist at Florida State University. Ultimately, having free arms "allowed gliding then flight in birds," he said.

Moreover, dinosaurs were likely warm blooded, according to research on their growth rates . "When you become a warm blooded animal, you can operate 24/7," Erickson told Live Science. "You're not at the whims of the environment in terms of being active."

Initially, dinosaurs were not as diverse as the crocodile-like archosaurs they were living alongside, Brusatte noted. In fact, dinosaurs "didn't become too successful right away; the crocs ruled the Triassic, then the end-Triassic extinction hit and the dinosaurs survived and took over."

The clade Dinosauria (which means "terrible lizard" in Greek) was coined in 1842 by the English paleontologist Richard Owen, who included the meat-eating theropod Megalosaurus , the long-necked sauropodomorph Cetiosaurus and the ornithiscian Iguanodon as the first known species in the clade, according to the book " Dinosaurs Rediscovered " (Thames & Hudson, 2019).

Each of these dinosaurs, it turns out, represents one of the three major dinosaur groups.

As of 2021, there were 1,545 scientifically described dinosaur species, according to the Paleobiology Database . About 50 previously unknown species are described each year, meaning there's roughly one newfound species described each week, Brusatte said. 

All of these dinosaurs fit into one of three groups: Ornithischia, Sauropodomorpha and Theropoda.

Ornithischia dinosaurs include beaked plant-eaters, such as Stegosaurus , duck-billed dinosaurs (also called hadrosaurs), as well as horned dinosaurs like Triceratops and armored dinosaurs like Ankylosaurus . Some ornithischians walked on four legs, while others walked on two. 

Sauropodomorpha dinosaurs were long-necked, pot-bellied dinosaurs that had tiny heads and column-like limbs. This group includes sauropods (such as Diplodocus ), their smaller antecedents (including Chromogisaurus ) and extra-large sauropods known as titanosaurs (such as Dreadnoughtus and Argentinosaurus ), which are among the largest land animals that have ever existed.

Theropoda is a group of meat-eating dinosaurs, although some (such as Chilesaurus diegosuarezi ) changed their diet to be herbivorous or omnivorous. Theropods include Tyrannosaurus rex and Velociraptor , as well as birds, which evolved from small theropods.

So, how are these groups related? It's up for debate. Ornithischian dinosaurs have a backward-pointing pubis bone in the hip, earning them the name bird-hipped dinosaurs. (However, they are not the ancestors of birds; theropods are.) Meanwhile, theropods and sauropodomorphs have saurischian or "reptile hips," which are also seen in modern crocodiles and lizards, according to the book "Dinosaurs Rediscovered."

Historically, it was thought that the reptile-hipped theropods and sauropodomorphs were more closely related to each other than to ornithischians. However, a 2017 study in the journal Nature uprooted the dinosaur family tree by suggesting that ornithischians and theropods were more closely related, based on analyses of 74 dinosaur species, Live Science previously reported . Shortly after, another 2017 study in the journal Nature found that neither family tree, as well as a third that is rarely considered, is statistically significant from the other, meaning all the suggested family trees are equally plausible until more evidence comes forth.

Dinosaurs lived during most of the Mesozoic era , a geological age that lasted from 252 million to 66 million years ago. The Mesozoic era includes the Triassic, Jurassic and Cretaceous periods. 

Dinosaurs arose from small dinosauromorph ancestors in the Triassic period, when the climate was harsh and dry. They faced "competition from the croc-line archosaurs for tens of millions of years, [but] finally prevailed when Pangaea began to split," Brusatte told Live Science. At this time, volcanoes erupted along the cracks of the supercontinent, causing global warming and mass extinction, he said.

During the Jurassic period (201.3 million to 145 million years ago), dinosaurs rose to dominance and some grew to huge sizes. For example, Vouivria damparisensis , the earliest titanosaur, dates to 160 million years ago. It weighed about 33,000 lbs. (15,000 kilograms) and measured more than 50 feet (15 meters) long. Iconic dinosaurs from this period include Brontosaurus , Brachiosaurus , Diplodocus and Stegosaurus . During the Jurassic, flowering plants evolved and birds, including Archaeopteryx , first appeared. There was "a small extinction at the end of the Jurassic that we still know little about," Brusatte said.

In the Cretaceous period, dinosaur dominance continued as the continents moved farther apart. Famous dinosaurs from this period include T. rex , Triceratops , Spinosaurus and Velociraptor . The largest dinosaurs on record, including Argentinosaurus , date to the Cretaceous. The Cretaceous period ended with the Cretaceous-Tertiary (K-Pg) extinction event, when a 6-mile-wide (10 kilometers) asteroid collided with Earth, leaving an impact crater more than 110 miles (180 km) in diameter in the Yucatan Peninsula of what is now Mexico.

The impact area, known as the Chicxulub (CHEEK-sheh-loob) crater, has evidence of "shocked quartz" and small glass-like spheres known as tektites, which form when rock is rapidly vaporized and cooled — geologic clues that a space rock struck there with incredible force, Betsy Kruk, an associate paleontologist with Paleo Solutions, a paleontological consulting company based in California, previously told Live Science . Chemical analyses from the sedimentary rock at Chicxulub melted and mixed together at temperatures on par with an asteroid strike about 66 million years ago, she added.

Some dinosaurs were enormous, but others were pipsqueaks. The smallest dinosaur on record is an avian dinosaur that's alive today: the bee hummingbird ( Mellisuga helenae ) from Cuba, which measures just over 2 inches (5 centimeters) long and weighs less than 0.07 ounce (2 grams). As for extinct, non-avian dinosaurs, there are a few contenders for smallest beast, including a bat-like dinosaur from China named Ambopteryx longibrachium that measured 13 inches (32 cm) long and weighed about 11 oz (306 g), according to a 2019 study in the journal Nature .

Titanosaurs were the largest dinosaurs. However, because paleontologists rarely find an entire skeleton, and because soft tissues, such as organs and muscles, rarely fossilize, it's challenging to determine dinosaur mass. However, contenders for the title of world's largest dinosaur include Argentinosaurus, which weighed up to 110 tons (100 metric tons), an unnamed 98 million-year-old titanosaur from Argentina that weighed upward of 69 tons (63 metric tons), and Patagotitan , which also weighed in at 69 tons.

The longest dinosaur was likely Supersaurus , a Jurassic sauropod that was at least 128 feet (39 meters) long, and possibly even reached 137 feet (42 m) in length, according to unpublished research presented at the Society of Vertebrate Paleontology's annual conference in 2021 . Another contender is Diplodocus, a long and slender Jurassic sauropod that could reach lengths of 108 feet (33 m), according to a 2006 study in the  New Mexico Museum of Natural History and Science Bulletin .

The tallest dinosaur is likely Giraffatitan , a 40-foot-tall (12 m) sauropod dinosaur from the late Jurassic, about 150 million years ago, which lived in what is now Tanzania.

Many amazing animals lived during the dinosaur age, and some are confused with dinosaurs. The most common misconception is calling  pterosaurs dinosaurs: They are not. Pterosaurs are winged reptiles and archosaurs, meaning they are relatives of dinosaurs, but they are not dinosaurs.

The order Crocodilia includes extinct and living crocodiles and their close relatives. Crocodilians are archosaurs, but they are not dinosaurs. Living crocodilians and birds (which are dinosaurs) are the only surviving members of the Archosauria clade.

The Mesozoic oceans teemed with sea life, including predatory reptiles known as mosasaurs (such as Mosasaurus ), plesiosaurs and ichthyosaurs. However, none of these reptiles are dinosaurs. 

Yes, some dinosaurs flaunted feathers, as do their bird descendants. Feathers don't fossilize well, but some remarkable fossils, especially those from Liaoning province in China that were buried in the aftermath of a volcanic eruption, have preserved feathers. Here are a few examples: Zhenyuanlong suni , Yutyrannus huali and Jianianhualong tengi .

It's unclear why dinosaurs first evolved feathers, but they could have been used for the following: as insulation to keep dinosaurs and their incubated eggs warm; for display to use for communication between dinosaurs, such as courtship displays; and for gliding or powered flight, Michael Habib, a research associate at the Dinosaur Institute at the Natural History Museum of Los Angeles County, previously told Live Science .

Initially, it was thought that only theropods and their descendants sported feathers, but researchers have also found downy feathers on the plant-eating ornithischian dinosaur Kulindadromeus zabaikalicus , suggesting that feathers were more widespread than previously thought, a 2014 study in the journal Science found.

It's possible that pterosaurs had feathers , according to a 2018 study in the journal Nature Ecology & Evolution , but more feathered specimens need to be found and analyzed to say so for sure.

Notably, even T. rex had feathers . However, depictions of dinosaurs rarely have feathers in popular culture, including the "Jurassic Park" movies. Paleontologist Jack Horner, who served as a scientific adviser on some of the "Jurassic Park" movies, remembers telling director Steven Spielberg that the dinosaurs should have feathers.

"Even when 'Jurassic Park' came out [in 1993], we knew that Velociraptors should have feathers, but at that time, it would have been technically difficult to do it, just from a CG [computer-generated] point of view. And Steven wasn't really too excited about it, anyway. When I told him they should be colorful and they should be feathered, and he said, 'Feathered Technicolor dinosaurs aren't scary enough,'" Horner previously told Live Science .

Some dinosaurs could fly, including the earliest known bird — Archaeopteryx — discovered in Germany and dating to about 150 million years ago, during the late Jurassic.

However, unlike most birds today, extinct dinosaurs likely just flew short distances. Research shows that powerful leg muscles, big wings and a relatively small body size were needed for takeoff and flight in ancient birds and bird-like dinosaurs, Habib previously told Live Science . His research suggests that the bird-like dinosaurs Microraptor , Rahonavis , and five avian genuses — Archaeopteryx , Sapeornis , Jeholornis , Eoconfuciusornis and Confuciusornis — would have been able to launch (without running) from the ground to initiate flight.

The bat-like dinosaur Yi qi , dating to China's Jurassic period, had wings, according to a 2015 study in the journal Nature . However, it likely didn't have powered flight and was probably a terrible glider, a 2020 study in the journal iScience found.

It's up for debate how well the dinosaurs were doing before the asteroid crashed into Earth. A handful of studies suggest that in the late Cretaceous, dinosaur extinctions were rising and diversity was declining, especially among herbivorous dinosaurs. But these studies rely on incomplete fossil data and models that may not tell the whole story, Live Science previously reported .

Even if dinosaur diversity was dropping, it's possible they could have bounced back had the asteroid not hit, Brusatte told Live Science. Dinosaurs lived on every continent, including Antarctica , and they filled different rungs in various ecosystems, from plant-eater to apex carnivore. "Dinosaurs had experienced many rises and falls in diversity over their 150-plus million year evolutionary history," he said. If the mass extinction hadn't happened, it's possible "They would still be thriving today as more than birds."

In the aftermath of the asteroid collision, long-term pain followed chaos. The collision caused massive destruction, including a shockwave, heat pulse, wildfires, tsunamis (including an immediate mile-high tsunami ), volcanic eruptions, lethal acid rain and earthquakes. Dust and grime that the asteroid kicked up hovered in the air. "This rain of hot dust raised global temperatures for hours after the impact, and cooked alive animals that were too large to seek shelter," according to Kruk. "Small animals that could shelter underground, underwater, or perhaps in caves or large tree trunks, may have been able to survive this initial heat blast."

The dust and particles remained in the air, blocking the sun for several years afterward and causing a nuclear winter that cooled the planet and led to the deaths of countless plants and animals, Brusatte and Kruk said. 

"Smaller, omnivorous terrestrial animals, like mammals, lizards, turtles, or birds, may have been able to survive as scavengers feeding on the carcasses of dead dinosaurs, fungi, roots and decaying plant matter, while smaller animals with lower metabolisms were best able to wait the disaster out," Kruk previously said. Moreover, the asteroid also pulverized carbon-rich rocks, which released carbon into the atmosphere and led to "global warming for a few thousand years," after the nuclear winter ended, Brusatte said.

Scientists used to wonder if the Deccan Traps volcanic eruptions in what is now India played a role in the mass extinction. But recent studies "show that the Deccan probably had very little impact," Brusatte said. It was "most likely an innocent bystander" — the asteroid is what caused the extinction.

In the popular movie franchise "Jurassic Park," scientists find dinosaur DNA preserved in an ancient mosquito caught in amber, and then fill in the DNA gaps with frog DNA. It's an entertaining plot, but the science is far from sound. For instance, amber does not preserve DNA well , and frogs are not at all closely related to dinosaurs; they're not archosaurs, and a 2017 study in the journal Proceedings of the National Academy of Sciences even found that frog evolution took off after the asteroid impact. 

For myriad reasons, it's currently impossible to bring extinct dinosaurs back. While dinosaur proteins and blood vessels have been found, scientists have yet to rigorously identify DNA from an extinct dinosaur. DNA begins decaying the moment an organism dies, but parts of it can be preserved in the right circumstances. That said, the oldest sequenced DNA on record belongs to a roughly 1 million-year-old mammoth , and dinosaurs went extinct about 66 million years ago.

Some scientists are studying how to reverse-engineer birds into dinosaurs, including the so-called " dino-chicken ," which would have a lengthened tail, teeth, arms and fingers. One group even gave chicken embryos dinosaur-like snouts. However, the "chickenosaurus" wouldn't be a replica of an ancient dinosaur, but rather a dinosaur-like bird, the researchers told Live Science . 

• Look up your favorite dinosaur on the Dino Directory from the Natural History Museum in London.
• Learn amazing dinosaur facts from the American Museum of Natural History in New York City.
• Take free, online college-level classes about the dinosaurs on Coursera, including " Dino 101: Dinosaur Paleobiology " and " Paleontology: Theropod Dinosaurs and the Origin of Birds ."

The Rise and Fall of the Dinosaurs: A New History of a Lost World - $17.99 on Amazon

Paleontologist and author Steve Brusatte explores the rise of the dinosaurs in the Triassic period until their fall with the collision of the asteroid at the end of the Cretaceous.

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Laura is the archaeology and Life's Little Mysteries editor at Live Science. She also reports on general science, including paleontology. Her work has appeared in The New York Times, Scholastic, Popular Science and Spectrum, a site on autism research. She has won multiple awards from the Society of Professional Journalists and the Washington Newspaper Publishers Association for her reporting at a weekly newspaper near Seattle. Laura holds a bachelor's degree in English literature and psychology from Washington University in St. Louis and a master's degree in science writing from NYU.

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Essays on Dinosaur

When it comes to choosing a topic for your dinosaur essay, the possibilities are endless. You could write about the different species of dinosaurs, their habitats, their extinction, or even theories about their existence. Whatever topic you choose, make sure it's something that interests you and that you can easily find information about.

If you're interested in writing an argumentative essay about dinosaurs, you could explore topics such as the role of dinosaurs in the ecosystem, the controversy surrounding their extinction, or the impact of dinosaur discoveries on scientific understanding. For a cause and effect essay, you might want to consider topics like the effects of climate change on dinosaur habitats or the consequences of asteroid impacts on dinosaur populations.

If you'd prefer to write an opinion essay, you could discuss your thoughts on the most fascinating dinosaur species, the most plausible theories about their extinction, or the importance of studying dinosaurs in modern times. And if you're more interested in writing an informative essay, you could delve into topics like the anatomy of dinosaurs, their behavior, or the latest discoveries in dinosaur research.

For example, if you're writing an essay about the impact of dinosaurs on the ecosystem, your thesis statement could be "Dinosaurs played a crucial role in shaping the prehistoric ecosystem and their extinction had a significant impact on the environment."

In the of your essay, you could start by providing a brief overview of the topic, followed by some background information on dinosaurs. You could also include a hook to grab the reader's attention, such as an interesting fact or a thought-provoking question.

In the of your essay, you could summarize the main points you've discussed, restate your thesis statement, and leave the reader with something to think about. You could also consider ending with a call to action, encouraging the reader to learn more about dinosaurs or to visit a museum or exhibit.

Research of How and Why Dinosaur Feathers Evolved

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The Way Paleontologists Identify Dinosaurs and Their Species

Why i consider tyrannosaurus rex to be the best dinosaur, teachers can become extinct as dinosaurs, the natural history museum: choosing between visiting, dinosaurs hall, birds of the world and hall of biodiversity, let us write you an essay from scratch.

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The Main Events that Happened During The Famous Supercontinent Pangea

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The 10 Most Important Facts About Dinosaurs

• Paleontologists
• Dinosaurs & Birds
• Marine Reptiles
• Prehistoric Mammals
• Habitat Profiles
• Marine Life
• B.S., Cornell University

It's common knowledge that dinosaurs were really big, some of them had feathers, and they all went extinct 65 million years ago after a giant meteor hit the Earth. But what don't you know? Here is a quick and easy overview of the most important highlights of what was happening in the Mesozoic Era.

Dinosaurs Weren't the First Reptiles to Rule the Earth

Dmitry Bogdanov / Wikimedia Commons / CC BY 3.0

The first dinosaurs evolved during the middle to late Triassic period—about 230 million years ago—in the part of the supercontinent of Pangea that now corresponds with South America. Before then, the dominant land reptiles were archosaurs ( ruling lizards ), therapsids (mammal-like reptiles), and pelycosaurs (typified by Dimetrodon ). For 20 million or so years after dinosaurs evolved, the most fearsome reptiles on Earth were prehistoric crocodiles . It was only at the beginning of the Jurassic period, 200 million years ago, that dinosaurs truly began their rise to dominance.

Dinosaurs Prospered for Over 150 Million Years

DEA Picture Library / Getty Images

With our 100-year-max life spans, humans aren't well adapted to understanding "deep time," as geologists call it. To put things in perspective: Modern humans have only existed for a few hundred thousand years, and human civilization only got started about 10,000 years ago, mere blinks of the eye by Jurassic time scales. Everyone talks about how dramatically (and irrevocably) the dinosaurs went extinct, but judging by the whopping 165 million years they managed to survive, they may have been the most successful vertebrate animals ever to colonize Earth.

The Dinosaur Kingdom Comprised Two Main Branches

You'd think it would be most logical to divide dinosaurs into herbivores (plant-eaters) and carnivores (meat-eaters), but paleontologists see things differently, distinguishing between saurischian ("lizard-hipped") and ornithischian ("bird-hipped") dinosaurs. Saurischian dinosaurs include both carnivorous theropods and herbivorous sauropods and prosauropods, while ornithischians account for the remainder of plant-eating dinosaurs, including hadrosaurs, ornithopods, and ceratopsians, among other dinosaur types . Oddly enough, birds evolved from "lizard-hipped," rather than "bird-hipped," dinosaurs.

Dinosaurs (Almost Certainly) Evolved Into Birds

Not every paleontologist is convinced—and there are some alternate (albeit not widely accepted) theories—but the bulk of the evidence points to modern birds having evolved from small, feathered, theropod dinosaurs during the Late Jurassic and Cretaceous periods. Bear in mind, though, that this evolutionary process may have happened more than once and that there were definitely some "dead ends" along the way (witness the tiny, feathered, four-winged Microraptor , which has left no living descendants). In fact, if you look at the tree of life cladistically—that is, according to shared characteristics and evolutionary relationships—it's completely appropriate to refer to modern birds as dinosaurs.

Some Dinosaurs Were Warm-Blooded

Salvatore Rabito Alcón / Wikimedia Commons / CC BY 3.0

Modern reptiles like turtles and crocodiles are cold-blooded, or "ectothermic," meaning they need to rely on the external environment to maintain their internal body temperatures. Modern mammals and birds are warm-blooded, or "endothermic," possessing active, heat-producing metabolisms that maintain constant internal body temperature, no matter the external conditions. There's a solid case to be made that at least some meat-eating dinosaurs—and even a few ornithopods —must have been endothermic since it's hard to imagine such an active lifestyle being fueled by a cold-blooded metabolism. On the other hand, it's unlikely that giant dinosaurs like Argentinosaurus were warm-blooded since they would have cooked themselves from the inside out in a matter of hours.

The Vast Majority of Dinosaurs Were Plant Eaters

Fierce carnivores like Tyrannosaurus rex and Giganotosaurus get all the press, but it's a fact of nature that the meat-eating "apex predators" of any given ecosystem are tiny in number compared to the plant-eating animals on which they feed (and which themselves subsist on the vast amounts of vegetation needed to sustain such large populations). By analogy with modern ecosystems in Africa and Asia, herbivorous hadrosaurs , ornithopods , and to a lesser extent sauropods , probably roamed the world's continents in vast herds, hunted by sparser packs of large-, small-, and medium-sized theropods.

Not All Dinosaurs Were Equally Dumb

DEA Picture Library / Getty Images

It's true that some plant-eating dinosaurs like the Stegosaurus had such tiny brains compared to the rest of their bodies that they were probably only a little smarter than a giant fern. But meat-eating dinosaurs large and small, ranging from Troodon to T. rex, possessed more respectable amounts of gray matter compared to their body size. These reptiles required better-than-average sight, smell, agility, and coordination to reliably hunt down prey. (Let's not get carried away, though—even the smartest dinosaurs were only on an intellectual par with modern ostriches.)

Dinosaurs Lived at the Same Time as Mammals

Many people mistakenly believe that mammals "succeeded" the dinosaurs 65 million years ago, appearing everywhere, all at once, to occupy the ecological niches rendered vacant by the K-T extinction event . The fact is, though, that early mammals lived alongside sauropods, hadrosaurs, and tyrannosaurs (usually high up in trees, away from the heavy foot traffic) for most of the Mesozoic Era. In fact, they evolved at around the same time—during the late Triassic period—from a population of therapsid reptiles. Most of these early furballs were about the size of mice and shrews, but a few (like the dinosaur-eating Repenomamus ) grew to respectable sizes of 50 pounds or so.

Pterosaurs and Marine Reptiles Weren't Technically Dinosaurs

Sergey Krasovskiy/Stocktrek Images / Getty Images

It may seem like nitpicking, but the word "dinosaur" applies only to land-dwelling reptiles possessing a specific hip and leg structure, among other anatomical characteristics . As large and impressive as some genera (such as Quetzalcoatlus and Liopleurodon ) were, flying pterosaurs and swimming plesiosaurs (ichthyosaurs and mosasaurs) weren't dinosaurs at all—and some of them weren't even all that closely related to dinosaurs, save for the fact that they're also classified as reptiles. While we're on the subject, Dimetrodon —which is often described as a dinosaur—was actually an entirely different kind of reptile that flourished tens of millions of years before the first dinosaurs evolved.

Dinosaurs Didn't All Go Extinct at the Same Time

When that meteor impacted the Yucatán Peninsula 65 million years ago, the result wasn't a huge fireball that instantly incinerated all of the dinosaurs on Earth, along with the pterosaurs, and marine reptiles . Rather, the process of extinction dragged on for hundreds, and possibly thousands, of years, as plunging global temperatures, lack of sunlight, and the resulting lack of vegetation profoundly altered the food chain from the bottom up. Some isolated dinosaur populations, sequestered in remote corners of the world, may have survived slightly longer than their brethren, but it's a sure fact that they are not alive today .

• How Did Dinosaurs Evolve?
• The First Dinosaurs
• 12 Frequently Asked Dinosaur Questions
• Learn About the Different Dinosaur Periods
• What Is the Scientific Definition of a Dinosaur, According to Experts?
• 10 Steps of Animal Evolution
• Why Did Dinosaurs Have Feathers?
• Early Dinosaur Pictures and Profiles
• 10 Facts About Reptiles
• Where Dinosaurs Lived
• The 15 Main Dinosaur Types
• 10 Myths About Dinosaur Extinction
• Facts About Coelophysis
• The Evolution of the First Mammals
• What Did Dinosaurs Eat?
• Were Dinosaurs Warm-Blooded?

Essays on Dinosaur

Short Essay & Paragraph On Dinosaurs For Kids Students

This is an essay and paragraph writing example on topic ” Dinosaurs” in English for students. This paragraph is written in very easy and simple English for kids and children.

Table of Contents

Short Paragraph About Dinosaurs For Students

Dinosaurs roamed the earth for over 160 million years and were some of the most formidable creatures to have ever lived on the planet. They were so big that many people mistook them for prehistoric monsters, but in reality they were very refined animals with complex social lives.

Whatever the cause, the loss of these great creatures left a gaping void in the history of our planet. Even after they are gone, we are still fascinated by dinosaurs and we learn more about them every day. They remain an important part of our culture and their story will be told for many years to come. Thank you dinosaur! You were pretty amazing creatures!.

Best Essay on Dinosaurs

Dinosaurs were a group of reptiles that lived during the Mesozoic Era, which lasted from about 252 to 66 million years ago. These ancient creatures varied greatly in size and shape, with some being as small as a turkey and others as large as a modern-day elephant. They lived on land, in water and in the air.

One of the most striking features of dinosaurs is their size and diversity. They had a wide range of physical characteristics, including sharp teeth, thick armor, and long tails. Some dinosaurs, such as the T-Rex, were predators, while others, such as the Stegosaurus, were herbivores.

Dinosaurs lived in a variety of habitats, including deserts, swamps, and forests. They were also found on every continent, including Antarctica, which was much warmer during the Mesozoic Era. Scientists believe that dinosaurs were the dominant form of life on Earth during the Mesozoic Era.

Despite their dominance, dinosaurs eventually went extinct about 66 million years ago, likely due to a massive asteroid impact. Today, scientists continue to study dinosaurs through their fossilized remains, and have gained a better understanding of their behavior, habitats, and extinction.

Q:1 When did dinosaurs live?

Dinosaurs lived during the Mesozoic Era, which lasted from about 252 to 66 million years ago.

Q;2 What were the different types of dinosaurs?

Dinosaurs varied greatly in size and shape, with some being predators and others being herbivores.

Q:3 How did dinosaurs go extinct?

Dinosaurs went extinct about 66 million years ago, likely due to a massive asteroid impact.

In conclusion, dinosaurs were a diverse group of ancient reptiles that lived during the Mesozoic Era. Despite their dominance on Earth, they eventually went extinct. Today, scientists continue to study dinosaurs through their fossilized remains, and have gained a better understanding of their behavior, habitats, and extinction. The study of dinosaurs provides us with valuable information about the past and helps us understand our place in the world and how it evolved to what it is today.

Hello! Welcome to my Blog StudyParagraphs.co. My name is Angelina. I am a college professor. I love reading writing for kids students. This blog is full with valuable knowledge for all class students. Thank you for reading my articles.

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12 Writing Prompts about Dinosaurs

The roar of the mighty tyrannosaurus rex, as it stomps through a wild primeval world.

The topic of dinosaurs has long captured the imaginations of young writers around the world, and today we’re sharing 12 prompts that should have no trouble getting the creative process underway.

We’ve included some which aim to start some thoughtful writing about the history of Earth, and others which are more suited to letting the imagination run wild in a short story or other fiction.

However you use them, we hope you find them helpful and inspiring!

Let’s get into it…

How to use the prompts:

You could try picking a specific prompt for each day of the week, for yourself or your students to write about – you’ll always have something new, while keeping a thread to the creative output and thinking.

Why not print the list, and cut them into strips – and pull out a prompt at random.

Try giving one prompt to a small group of students, and have them discuss the topic for a time, before coming back to tell the class about it – or writing for 30 minutes on the subject at hand.

The Dinosaur Writing Prompts:

• Imagine if the dinosaurs still roamed earth today. How would humans live alongside them?
• Some of the dinosaur species were huge. Why do you think we don’t see animals that size alive today?
• Imagine you time travel back to the age of the dinosaurs. How would you stay safe? Where would you set up camp?
• Write about going on a family holiday, and stumbling across a giant dinosaur fossil.
• If scientists were able to clone dinosaurs from fossils and bring them back to life, do you think they should? Why?
• Describe dinosaurs not on land, but in living in the oceans.
• Do you think it’s possible that somewhere in the deepest unexplored oceans, dinosaurs still swim?
• What animal species alive today do you think are closely related to the dinosaurs?
• Write about finding a dinosaur egg stuck in glacier ice, and bringing it home. What happens next?
• What are your thoughts about dinosaur “families”? Do you think they would look after their young, or would they have to fend for themselves as soon as they hatched?
• Did the dinosaurs sleep like we do? Would they have slept standing up, or laid down in the forest?
• Imagine a world where humans lived alongside dinosaurs. How might we use them to help us farm the land?

Looking for some more writing prompts?

Well you are in luck, we have thousands more where that came from!

Try our site search box to find prompts on a specific topic, either for story writing, or journaling.

You can also browse our writing prompt collection to find something that you’d like to use.

If there are other resources that you’d love us to make for you to use, please feel free to get in touch! We always love to hear from our amazing positive community.

Yours, Matt & Hayley

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Essays on Dinosaur

Dinosaurs are a kind of ancient reptile that lived in this universe about 245 million years ago. Some of the birds that are dinosaurs are modern birds; this is attributed to the fact that they have the same ancestor as the non-avian dinosaurs. Non-avian dinosaurs, which are now extinct, ranged...

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English Essay on “Dinosaurs” Essay-Paragraph-Speech for Class 8, 9, 10, 11 and 12 CBSE Students and competitive Examination.

Millions of years ago, long before there were any people, there were dinosaurs. Dinosaurs were one of several kinds of prehistoric reptiles that lived during the Mesozoic Era, the “Age of Reptiles.” Dinosaurs were reptiles and most hatched from eggs. No dinosaurs could fly and none lived in the water. Plant-eating sauropods were the largest animals to ever walk on earth, but blue whales are more massive than any of the dinosaurs were! The largest dinosaurs were over 100 feet long and up to 50 feet tall (like Argentinosaurus, Seismosaurus, Ultrasauros, Brachiosaurus, and Supersaurus). The smallest dinosaurs, like Compsognathus, were about the size of a chicken.

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Dinosaurs Essay In English In 150,200 & 250 Words For Students

Dinosaurs Essay :- Hello students, Today we teach you how to writer Short Essay On Dinosaurs, Lots of times this essay asked in exam as Essay on Dinosaurs, and Dinosaurs Essay for students. So, Don’t confused stay in this blog and note down in your copy.

Covered Points In This Post

Main Points Of Dinosaurs Essay

• Introduction
• Time of the dinosaurs
• Types of Dinosours
• Shapes and Sizes

Dinosaurs Essay In English For Students

Introduction – ‘Jurassic Park’ had been a film, which has created a storm. It opened up a volcano of interest in the earliest inhabitants of the earth. It has been created the new hero for the children “The Dinosaur”. There is a craze to discover, most interesting ancestors of Dinosaur who are extinct. They were monafrous and giant. dinosaurs were the forerunners of animal life on earth.

Time of the dinosaurs – Nearly 150 million years ago, the great dinosaurs ruled the earth. Dinosaur literally means ‘a terrible lizard’ . Like lizards, dinosaurs had hard, rough, and scaly skin. They were cold blooded reptiles. They laid eggs and had long legs. They lived on swamps, on land, mountains, rivers, forests, everywhere on the earth.

Types of Dinosours – There were hundreds types of dinosaurs. They are divided into dimthosichains (bird hipped dinosaurs) such as protesarataps and had hip bone similar to birds and SAURICHIANS with hip bone similar to lizards like DIPLODOCUS. Some were meat eating and some were plant eaters.

Shapes and Sizes – Dinosaurs varied greatly in their size, shape and features. They did not live at the same time. Some lived 200 million years ago, other 70 million years were giants. Some such as COMPSO GNATHUS was of size of a chicken and Heterodontesaorus was of size of a large dog. Some such as BRONTOSAURS and DIPLODOLUS were really giants.

Conclusion – About 65 million years, ago, long before man came into existence, dinosaurs and the flying and swimming reptiles died out abruptly. The only records left are their fossils the reason for their abrupt disappearance still remains a mystery.

So, Students this is full An Essay On Park, if you like this Essay then don’t forget to bookmark  our website  and  join our telegram  for more essay our website always provide good quality essay.

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