Dinosaurs: Most Popular Articles
These articles are the most popular over the last month.
10 Biggest Dinosaurs
How heavy was Argentinosaurus? What was the wingspan of Quetzalcoatlus? Read this list of the 10 biggest dinosaurs (as well as non-dinosaur reptiles like pterosaurs, pliosaurs and therapsids) to find out.
How heavy was Argentinosaurus? What was the wingspan of Quetzalcoatlus? Read this list of the 10 biggest dinosaurs (as well as non-dinosaur reptiles like pterosaurs, pliosaurs and therapsids) to find out.
Dinosaurs A to C
A complete, A-Z list of every dinosaur that ever lived, including herbivorous and carnivorous dinosaurs, avian and aquatic reptiles, and the primitive reptiles that preceded (and lived alongside) the dinosaurs.
A complete, A-Z list of every dinosaur that ever lived, including herbivorous and carnivorous dinosaurs, avian and aquatic reptiles, and the primitive reptiles that preceded (and lived alongside) the dinosaurs.
Weirdest Dinosaurs
Not all dinosaurs (or archosaurs, or pterosaurs) sported the same plain-vanilla body plans. Some of these creatures stood out even by the bizarre standards of the Mesozoic Era, with strange adaptations that continue to puzzle paleontologists to the present day. Here’s a list of the 10 weirdest reptiles ever to walk (or crawl, or fly) the earth 100 million years ago.
Not all dinosaurs (or archosaurs, or pterosaurs) sported the same plain-vanilla body plans. Some of these creatures stood out even by the bizarre standards of the Mesozoic Era, with strange adaptations that continue to puzzle paleontologists to the present day. Here’s a list of the 10 weirdest reptiles ever to walk (or crawl, or fly) the earth 100 million years ago.
Three Ages of Dinosaurs
A quick guide to the animals, plants, climate and geology of the Triassic period (250-208 million years ago).
A quick guide to the animals, plants, climate and geology of the Triassic period (250-208 million years ago).
Raptors
Among the most feared predators of prehistoric times, raptors (also known as dromaeosaurs) were closely related to modern birds. Here's a look at how paleontologists classify raptors, as well as profiles of the most well-known genuses ranging from Achillobator to Utahraptor.
Among the most feared predators of prehistoric times, raptors (also known as dromaeosaurs) were closely related to modern birds. Here's a look at how paleontologists classify raptors, as well as profiles of the most well-known genuses ranging from Achillobator to Utahraptor.
10 Deadliest Dinosaurs
Not all dinosaurs were equally dangerous--some were built for exceptional mayhem, sporting huge teeth, sharp claws, and (occasionally) even the ability to outwit their prey. Here's a list of the 10 fiercest, deadliest, and just plain most dangerous dinosaurs, pterosaurs, and aquatic reptiles. If you see one of these guys on the street--run!
Not all dinosaurs were equally dangerous--some were built for exceptional mayhem, sporting huge teeth, sharp claws, and (occasionally) even the ability to outwit their prey. Here's a list of the 10 fiercest, deadliest, and just plain most dangerous dinosaurs, pterosaurs, and aquatic reptiles. If you see one of these guys on the street--run!
Quetzalcoatlus
One of the largest creatures ever to take to the sky.
One of the largest creatures ever to take to the sky.
Spinosaurus
This carnivore was distinguished by the sail-like structure on its back.
This carnivore was distinguished by the sail-like structure on its back.
12 Best Dinosaurs
There were literally hundreds of kinds of dinosaurs, but only twelve that merit memorization by eager dinosaur lovers, young or old. Here are the dozen dinosaurs every kid and adult should have down cold, ranging from T. Rex to Triceratops.
There were literally hundreds of kinds of dinosaurs, but only twelve that merit memorization by eager dinosaur lovers, young or old. Here are the dozen dinosaurs every kid and adult should have down cold, ranging from T. Rex to Triceratops.
Tyrannosaurus Rex
The once--and always--king of the dinosaurs.
The once--and always--king of the dinosaurs.
Argentinosaurus
Possibly the largest herbivore that ever lived.
Possibly the largest herbivore that ever lived.
The 10 Smartest Dinosaurs
Pound for pound, dinosaurs were some of the dumbest creatures ever to roam the planet. However, not all raptors, tyrannosaurs, stegosaurs and hadrosaurs were equally stupid; some may even (just barely) have attained a mammalian level of intelligence. Here's a list of the 10 smartest dinosaurs, based on an analysis of their anatomy and behavioral patterns.
Pound for pound, dinosaurs were some of the dumbest creatures ever to roam the planet. However, not all raptors, tyrannosaurs, stegosaurs and hadrosaurs were equally stupid; some may even (just barely) have attained a mammalian level of intelligence. Here's a list of the 10 smartest dinosaurs, based on an analysis of their anatomy and behavioral patterns.
Utahraptor
Probably the biggest raptor that ever lived.
Probably the biggest raptor that ever lived.
Pterosaurs
Though they weren't technically dinosaurs, pterosaurs ("winged lizards") ruled the skies of the Triassic, Jurassic and Cretaceous periods at the same time as their terrestrial cousins dominated the land. Here's a look at pterosaur evolution, behavior and physiology, along with a list of genuses ranging from Anurognathus to Zhejiangopterus.
Though they weren't technically dinosaurs, pterosaurs ("winged lizards") ruled the skies of the Triassic, Jurassic and Cretaceous periods at the same time as their terrestrial cousins dominated the land. Here's a look at pterosaur evolution, behavior and physiology, along with a list of genuses ranging from Anurognathus to Zhejiangopterus.
Sauropods
The sauropods were the true giants of the dinosaur family; some of them may have attained lengths of 100 feet and weights of 100 tons. Here's a brief overview of what makes a sauropod a sauropod, as well as an alphabetical list of genuses ranging from Apatosaurus to Vulcanodon.
The sauropods were the true giants of the dinosaur family; some of them may have attained lengths of 100 feet and weights of 100 tons. Here's a brief overview of what makes a sauropod a sauropod, as well as an alphabetical list of genuses ranging from Apatosaurus to Vulcanodon.
Velociraptor
This dinosaur was vicious--but a lot smaller than you thought.
This dinosaur was vicious--but a lot smaller than you thought.
Why Dinosaurs Were Big
Species by species, individual by individual, dinosaurs were bigger than any other land-dwelling animals that ever lived. Here are some theories that just might account for dinosaur gigantism.
Species by species, individual by individual, dinosaurs were bigger than any other land-dwelling animals that ever lived. Here are some theories that just might account for dinosaur gigantism.
Pteranodon
Many people use the name pterodactyl to refer to two distinct pterosaur genuses, Pterodactylus and Pteranodon. Here are pictures, illustrations and photographs of these two famous flying reptiles.
Many people use the name pterodactyl to refer to two distinct pterosaur genuses, Pterodactylus and Pteranodon. Here are pictures, illustrations and photographs of these two famous flying reptiles.
Tyrannosaurs
Tyrannosaurs (technically known as "tyrannosaurids") were the killing machines of the Cretaceous period: these huge, powerful beasts were all legs, trunk and teeth, and they preyed relentlessly on smaller, herbivorous dinosaurs. Here’s a look at how paleontologists classify tyrannosaurs, as well as profiles of the most notable genuses, ranging from T. Rex to Guanlong.
Tyrannosaurs (technically known as "tyrannosaurids") were the killing machines of the Cretaceous period: these huge, powerful beasts were all legs, trunk and teeth, and they preyed relentlessly on smaller, herbivorous dinosaurs. Here’s a look at how paleontologists classify tyrannosaurs, as well as profiles of the most notable genuses, ranging from T. Rex to Guanlong.
The 12 Main Dinosaur Groups
As much as our views about dinosaurs have changed over the past 100 years, one thing has remained constant: the major groups to which these ancient reptiles are assigned. Here are the 12 most important dinosaur families, ranging from ankylosaurs to tyrannosaurs, complete with links to additional information.
As much as our views about dinosaurs have changed over the past 100 years, one thing has remained constant: the major groups to which these ancient reptiles are assigned. Here are the 12 most important dinosaur families, ranging from ankylosaurs to tyrannosaurs, complete with links to additional information.
Allosaurus
One of the most common predators of the Jurassic era.
One of the most common predators of the Jurassic era.
Liopleurodon
This mean-looking pliosaur was one of the biggest of all marine reptiles.
This mean-looking pliosaur was one of the biggest of all marine reptiles.
Spinosaurus Facts
Spinosaurus is the largest carnivorous dinosaur ever to be discovered, bigger even than T. Rex and Giganotosaurus. Here are 10 facts you may (or may not) have known about this enormous predator.
Spinosaurus is the largest carnivorous dinosaur ever to be discovered, bigger even than T. Rex and Giganotosaurus. Here are 10 facts you may (or may not) have known about this enormous predator.
Before the Dinosaurs
Dinosaurs weren’t the first four-legged creatures to prosper on land. The Carboniferous and Permian periods witnessed a large variety of "primitive" terrestrial reptiles--many of which had surprisingly advanced features.
Dinosaurs weren’t the first four-legged creatures to prosper on land. The Carboniferous and Permian periods witnessed a large variety of "primitive" terrestrial reptiles--many of which had surprisingly advanced features.
Sauroposeidon
One of the tallest dinosaurs ever to walk the earth.
One of the tallest dinosaurs ever to walk the earth.
Giganotosaurus
Not quite a "Gigantosaurus," but close enough.
Not quite a "Gigantosaurus," but close enough.
The First Mammals
It's not quite true that mammals succeeded the dinosaurs--they lived right alongside these lumbering beasts, in small, quivering, furry form, all through the Mesozoic Era. Here's a look at the evolution, anatomy and survival strategies of the early mammals of the Triassic, Jurassic and Cretaceous periods.
It's not quite true that mammals succeeded the dinosaurs--they lived right alongside these lumbering beasts, in small, quivering, furry form, all through the Mesozoic Era. Here's a look at the evolution, anatomy and survival strategies of the early mammals of the Triassic, Jurassic and Cretaceous periods.
Deinonychus
One of the most fearsome predators of the Cretaceous period.
One of the most fearsome predators of the Cretaceous period.
How Did Dinosaurs Evolve?
Like all living creatures, dinosaurs evolved from preexisting ancestors. Here's an overview of current thinking about dino evolution.
Like all living creatures, dinosaurs evolved from preexisting ancestors. Here's an overview of current thinking about dino evolution.
Crocodiles
Toward the end of the Triassic period 200 million years ago, the archosaurs ("ruling lizards") started to branch off into three major groups: the dinosaurs, the pterosaurs, and the crocodiles. Here's an overview of the crocodiles that lived alongside dinosaurs, as well as profiles of genuses ranging from Bernissartia to Stomatosuchus.
Toward the end of the Triassic period 200 million years ago, the archosaurs ("ruling lizards") started to branch off into three major groups: the dinosaurs, the pterosaurs, and the crocodiles. Here's an overview of the crocodiles that lived alongside dinosaurs, as well as profiles of genuses ranging from Bernissartia to Stomatosuchus.
Megalodon Facts
Megalodon was the biggest prehistoric shark that ever lived. Here are 10 facts you may or may not have known about this enormous predator.
Megalodon was the biggest prehistoric shark that ever lived. Here are 10 facts you may or may not have known about this enormous predator.
How Smart Were Dinosaurs?
Did all dinosaurs have a brain the size of a walnut, or might some of them have been as smart as very small mammals? Here's a look at modern views of dinosaur intelligence.
Did all dinosaurs have a brain the size of a walnut, or might some of them have been as smart as very small mammals? Here's a look at modern views of dinosaur intelligence.
Dinosaur Mating
What we don't know about dinosaur mating can fill a library--after all, it's not as if the act of sex leaves fossil evidence. But we can make some educated guesses, based on the size of dinosaurs and their reptilian heritage.
What we don't know about dinosaur mating can fill a library--after all, it's not as if the act of sex leaves fossil evidence. But we can make some educated guesses, based on the size of dinosaurs and their reptilian heritage.
Were Dinosaurs Warm-Blooded?
Although many people think the issue has been settled once and for all, scientists still debate whether dinosaurs were warm-blooded or cold-blooded (or something in between). Here's a look at the evidence for and against warm-blooded dinos.
Although many people think the issue has been settled once and for all, scientists still debate whether dinosaurs were warm-blooded or cold-blooded (or something in between). Here's a look at the evidence for and against warm-blooded dinos.
Tyrannosaurus Rex Facts
Did you know that the average Tyrannosaurus Rex lived to be about 30 years old? Or that T. Rex babies may have been covered in feathers? Here are 10 essential facts about the king of the dinosaurs.
Did you know that the average Tyrannosaurus Rex lived to be about 30 years old? Or that T. Rex babies may have been covered in feathers? Here are 10 essential facts about the king of the dinosaurs.
Plesiosaurs and Pliosaurs
During the Jurassic and Cretaceous periods, the earth's oceans, lakes and rivers were filled by large, agile reptiles, called plesiosaurs and pliosaurs, that looked uncannily like sea serpents. Here's an overview of the evolution, behavior and characteristics of these fearsome creatures, along with a list of genuses ranging from Aristonectes to Woolungasaurus.
During the Jurassic and Cretaceous periods, the earth's oceans, lakes and rivers were filled by large, agile reptiles, called plesiosaurs and pliosaurs, that looked uncannily like sea serpents. Here's an overview of the evolution, behavior and characteristics of these fearsome creatures, along with a list of genuses ranging from Aristonectes to Woolungasaurus.
Albertosaurus
This tyrannosaur was a close cousin of T. Rex.
This tyrannosaur was a close cousin of T. Rex.
Prehistoric Whales
It may be hard to believe, but modern whales evolved from terrestrial, dog-sized mammals that roamed central Asia about 50 million years ago. Here's the story of cetacean evolution, along with profiles of a dozen prehistoric species.
It may be hard to believe, but modern whales evolved from terrestrial, dog-sized mammals that roamed central Asia about 50 million years ago. Here's the story of cetacean evolution, along with profiles of a dozen prehistoric species.
Dinosaur Christmas Gifts
Wondering what to buy for your favorite dinosaur fan this Christmas season? Here's a list of the 10 best dinosaur-themed books, toys, DVDs and video games for both adults and kids.
Wondering what to buy for your favorite dinosaur fan this Christmas season? Here's a list of the 10 best dinosaur-themed books, toys, DVDs and video games for both adults and kids.
Sarcosuchus
This Cretaceous "SuperCroc" put modern crocodiles to shame.
This Cretaceous "SuperCroc" put modern crocodiles to shame.
Five Smallest Dinosaurs
Not all dinosaurs were as big as houses--some were as small as wiener dogs, or even smaller. Here's a list of the five most diminutive dinos (plus a couple of aquatic and avian reptiles).
Not all dinosaurs were as big as houses--some were as small as wiener dogs, or even smaller. Here's a list of the five most diminutive dinos (plus a couple of aquatic and avian reptiles).
Fictional Dinosaurs
Dinosaurs aren't only found in dried-up riverbeds and ancient quarries--they can also be seen in TV shows, movies, comic strips and video games. Here's a selection of pop culture's most notable dinosaurs, most of which wouldn't stand a fighting chance against their paleontologically correct forebears.
Dinosaurs aren't only found in dried-up riverbeds and ancient quarries--they can also be seen in TV shows, movies, comic strips and video games. Here's a selection of pop culture's most notable dinosaurs, most of which wouldn't stand a fighting chance against their paleontologically correct forebears.
Ceratopsians
Probably the oddest-looking dinosaurs that ever lived, ceratopsians--"horned faces"--included such familiar herbivores as Triceratops and Pentaceratops. Here's a look at how paleontologists define ceratopsians, along with links to a dozen representative genuses.
Probably the oddest-looking dinosaurs that ever lived, ceratopsians--"horned faces"--included such familiar herbivores as Triceratops and Pentaceratops. Here's a look at how paleontologists define ceratopsians, along with links to a dozen representative genuses.
Triceratops
The famous three-horned plant-eater.
The famous three-horned plant-eater.
Saber-Toothed Cats
They weren't technically tigers, but the saber-toothed cats were every bit as dangerous to the grazing mammals (and early hominids) of their day. Here's a look at saber-tooth evolution and lifestyles, and profiles of various genuses of saber-toothed cats.
They weren't technically tigers, but the saber-toothed cats were every bit as dangerous to the grazing mammals (and early hominids) of their day. Here's a look at saber-tooth evolution and lifestyles, and profiles of various genuses of saber-toothed cats.
10 Biggest Dinosaur Blunders
Paleontologists once believed that Stegosaurus had a brain its butt, that Brachiosaurus lived underwater, and that you could find Hypsilophodons nesting in trees. Here's a list of the 10 most notable mistakes in the history of dinosaur paleontology.
Paleontologists once believed that Stegosaurus had a brain its butt, that Brachiosaurus lived underwater, and that you could find Hypsilophodons nesting in trees. Here's a list of the 10 most notable mistakes in the history of dinosaur paleontology.
Hadrosaurs
Among the last--and most common--dinosaurs to roam the earth, hadrosaurs were large, low-slung plant eaters with tough beaks on their snouts to dig out vegetation. Here’s a look at how paleontologists classify these duck-billed herbivores, as well as a list of the most notable genuses, ranging from Anatotitan to Telmatosaurus.
Among the last--and most common--dinosaurs to roam the earth, hadrosaurs were large, low-slung plant eaters with tough beaks on their snouts to dig out vegetation. Here’s a look at how paleontologists classify these duck-billed herbivores, as well as a list of the most notable genuses, ranging from Anatotitan to Telmatosaurus.
Top Dinosaurs of the Decade
This past decade's dinosaur discoveries have turned the world of paleontology on its Jurassic ear. Here are the top 10 dinosaurs (plus one mammal, one pterosaur and one crocodile, for good measure) that helped define the past ten years.
This past decade's dinosaur discoveries have turned the world of paleontology on its Jurassic ear. Here are the top 10 dinosaurs (plus one mammal, one pterosaur and one crocodile, for good measure) that helped define the past ten years.
10 Major Fossil Discoveries
Not every fossil dug up on a distant lakebed or arid mountain plain has had an equally profound effect on the course of dinosaur science. Here are 10 notable discoveries that changed, sharpened, or completely altered the views of working scientists (and the general public) about these long-extinct reptiles.
Not every fossil dug up on a distant lakebed or arid mountain plain has had an equally profound effect on the course of dinosaur science. Here are 10 notable discoveries that changed, sharpened, or completely altered the views of working scientists (and the general public) about these long-extinct reptiles.
Dinosaur Life Spans
Did dinosaurs live for hundreds of years, like modern tortoises, or did they have "mammalian" life spans that could be measured in years or decades? Here's what we currently know about how long dinosaurs lived, and the issues that complicate calculations of dinosaur life spans.
Did dinosaurs live for hundreds of years, like modern tortoises, or did they have "mammalian" life spans that could be measured in years or decades? Here's what we currently know about how long dinosaurs lived, and the issues that complicate calculations of dinosaur life spans.
Megalosaurus
The first dinosaur ever to be discovered and named.
The first dinosaur ever to be discovered and named.
Prehistoric Elephants
Modern elephants belong to a long and distinguished evolutionary line that dates back 60 million years, to shortly after the extinction of the dinosaurs. Here's a brief history of prehistoric pachyderms, along with profiles of extinct species ranging from Amebelodon to Stegomastodon.
Modern elephants belong to a long and distinguished evolutionary line that dates back 60 million years, to shortly after the extinction of the dinosaurs. Here's a brief history of prehistoric pachyderms, along with profiles of extinct species ranging from Amebelodon to Stegomastodon.
Dinosaurs: Ancient Fossils, New Discoveries
Fossil pictures from the recent display at the American Museum of Natural History.
Fossil pictures from the recent display at the American Museum of Natural History.
Dinos and Creationists
Creationist don't believe in evolution, and insist that the earth is only a few thousand years old. How do dinosaurs fit in their world view?
Creationist don't believe in evolution, and insist that the earth is only a few thousand years old. How do dinosaurs fit in their world view?
Parasaurolophus
Probably the loudest dinosaur that ever roamed the earth.
Probably the loudest dinosaur that ever roamed the earth.
Dinosaur Jokes
Why did the T. Rex cross the road? How can you tell when there's a Stegosaurus in your refrigerator? Read this collection of dinosaur jokes and riddles to find out!
Why did the T. Rex cross the road? How can you tell when there's a Stegosaurus in your refrigerator? Read this collection of dinosaur jokes and riddles to find out!
Apatosaurus
The dinosaur formerly known as Brontosaurus.
The dinosaur formerly known as Brontosaurus.
Lystrosaurus
This pig-like reptile preceded the dinosaurs.
This pig-like reptile preceded the dinosaurs.
Nodosaurus
Pictures, illustrations and photographs of ankylosaur dinosaurs, ranging from Acanthopholis to Tarchia.
Pictures, illustrations and photographs of ankylosaur dinosaurs, ranging from Acanthopholis to Tarchia.
Velociraptor Facts
Next to T. Rex, Velociraptor is the most famous carnivorous dinosaur that ever lived. Here are 10 facts about this meat-eater that you may (or may not) have gleaned from repeated viewings of Jurassic Park.
Next to T. Rex, Velociraptor is the most famous carnivorous dinosaur that ever lived. Here are 10 facts about this meat-eater that you may (or may not) have gleaned from repeated viewings of Jurassic Park.
Kronosaurus
This pliosaur made a great white shark seem like a guppy by comparison.
This pliosaur made a great white shark seem like a guppy by comparison.
Achillobator
This fierce raptor was discovered in modern-day Mongolia.
This fierce raptor was discovered in modern-day Mongolia.
Brachiosaurus
The giant, gentle, long-necked plant-eater.
The giant, gentle, long-necked plant-eater.
Titanosaurs
By the end of the Cretaceous period, the only sauropods left standing were the titanosaurs--mysterious, armored plant-eaters whose partial skeletons have been found all over the world. Here's a look at how these strange creatures are classified, along with profiles of genuses ranging from Aegyptosaurus to Saltasaurus.
By the end of the Cretaceous period, the only sauropods left standing were the titanosaurs--mysterious, armored plant-eaters whose partial skeletons have been found all over the world. Here's a look at how these strange creatures are classified, along with profiles of genuses ranging from Aegyptosaurus to Saltasaurus.
Dino-Birds
In the Mesozoic Era, there wasn't just one "missing link" that connected dinosaurs and birds, but dozens of them: small, feathered theropods that showed a tantalizing mixture of dinosaur and bird features. Here's what we know about these "dino-birds," as they're sometimes called.
In the Mesozoic Era, there wasn't just one "missing link" that connected dinosaurs and birds, but dozens of them: small, feathered theropods that showed a tantalizing mixture of dinosaur and bird features. Here's what we know about these "dino-birds," as they're sometimes called.
Baryonyx
Long story short, you wouldn't want to clip this dinosaur's claws.
Long story short, you wouldn't want to clip this dinosaur's claws.
Elasmosaurus
From head to tail, the longest plesiosaur that ever lived.
From head to tail, the longest plesiosaur that ever lived.
Strange Dinosaur Names
After long, weary months collecting bones out in the field, cleaning them in the lab with tiny toothpicks, and laboriously piecing them together for display or further study, paleontologists can be forgiven for occasionally bestowing strange names on the objects of their research. Here are the 10 dinosaurs with the weirdest, funniest, and (in one or two cases) most inappropriate names.
After long, weary months collecting bones out in the field, cleaning them in the lab with tiny toothpicks, and laboriously piecing them together for display or further study, paleontologists can be forgiven for occasionally bestowing strange names on the objects of their research. Here are the 10 dinosaurs with the weirdest, funniest, and (in one or two cases) most inappropriate names.
Stegosaurus
The spike-tailed, small-brained plant eater.
The spike-tailed, small-brained plant eater.
K/T Extinction
What caused the sudden extinction of the dinosaurs 65 million years ago? Most scientists blame an astronomical impact.
What caused the sudden extinction of the dinosaurs 65 million years ago? Most scientists blame an astronomical impact.
Acrocanthosaurus
The largest predator of the early Cretaceous period.
The largest predator of the early Cretaceous period.
Ankylosaurus
The Cretaceous equivalent of a Sherman tank.
The Cretaceous equivalent of a Sherman tank.
Big Theropods
We know all about tyrannosaurs and raptors, but those two families comprised only a small percentage of the bipedal, carnivorous dinosaurs known as theropods. Here's a look at the larger theropods of the Mesozoic Era, including allosaurs and abelisaurs, as well as profiles of representative theropod genuses.
We know all about tyrannosaurs and raptors, but those two families comprised only a small percentage of the bipedal, carnivorous dinosaurs known as theropods. Here's a look at the larger theropods of the Mesozoic Era, including allosaurs and abelisaurs, as well as profiles of representative theropod genuses.
Abelisaurus
"Abel's lizard" has been reconstructed from a single skull.
"Abel's lizard" has been reconstructed from a single skull.
Ichthyosaurs
Although they weren't technically dinosaurs, ichthyosaurs ("fish lizards") ruled the Triassic and Jurassic oceans in much the same way tyrannosaurs ruled the continents. Here's a look at how paleontologists classify these sleek predators, along with profiles of genuses ranging from Californosaurus to Utatsusaurus.
Although they weren't technically dinosaurs, ichthyosaurs ("fish lizards") ruled the Triassic and Jurassic oceans in much the same way tyrannosaurs ruled the continents. Here's a look at how paleontologists classify these sleek predators, along with profiles of genuses ranging from Californosaurus to Utatsusaurus.
Oviraptor
Turns out that this "egg thief" got a bad rap.
Turns out that this "egg thief" got a bad rap.
Shonisaurus
The largest ichthyosaur yet to be discovered.
The largest ichthyosaur yet to be discovered.
Microraptor
This tiny dinosaur had a birdlike appearance--but with four wings rather than two.
This tiny dinosaur had a birdlike appearance--but with four wings rather than two.
Ankylosaurs
Ankylosaurs were among the last dinosaurs standing 65 million years ago, and with good reason: these otherwise gentle herbivores were the Cretaceous equivalent of Sherman tanks, complete with armor plating, sharp spikes and heavy clubs. Here's a look at how paleontologists classify ankylosaurs, as well as profiles of genuses ranging from Acanthopholis to Tarchia.
Ankylosaurs were among the last dinosaurs standing 65 million years ago, and with good reason: these otherwise gentle herbivores were the Cretaceous equivalent of Sherman tanks, complete with armor plating, sharp spikes and heavy clubs. Here's a look at how paleontologists classify ankylosaurs, as well as profiles of genuses ranging from Acanthopholis to Tarchia.
Prehistoric Horses
Horses have come a long way since their tiny, ferret-sized ancestors prowled the woodlands of North America, 10 million years after the extinction of the dinosaurs. Here's a look at horse evolution, along with profiles of various prehistoric horse genuses.
Horses have come a long way since their tiny, ferret-sized ancestors prowled the woodlands of North America, 10 million years after the extinction of the dinosaurs. Here's a look at horse evolution, along with profiles of various prehistoric horse genuses.
Pachycephalosaurs
Twenty million years before the dinosaurs went extinct, a strange new breed evolved: medium-sized, four-legged herbivores with unusually thick skulls. Here's a look at current thinking about pachycephalosaurs ("thick-headed lizards"), as well as links to profiles of genuses ranging from Colepiocephale (Greek for "knucklehead") to Wannanosaurus.
Twenty million years before the dinosaurs went extinct, a strange new breed evolved: medium-sized, four-legged herbivores with unusually thick skulls. Here's a look at current thinking about pachycephalosaurs ("thick-headed lizards"), as well as links to profiles of genuses ranging from Colepiocephale (Greek for "knucklehead") to Wannanosaurus.
Carcharodontosaurus
Its name means "great white shark lizard." Impressed yet?
Its name means "great white shark lizard." Impressed yet?
All About Spinosaurus
The sail-backed Spinosaurus was the largest carnivorous dinosaur that ever lived. Here's everything you need to know about this fearsome meat-eater, complete with links to additional information.
The sail-backed Spinosaurus was the largest carnivorous dinosaur that ever lived. Here's everything you need to know about this fearsome meat-eater, complete with links to additional information.
Ghost Ranch
Thousands of Coelophysis skeletons have been discovered here.
Thousands of Coelophysis skeletons have been discovered here.
Dinosaur Combat
Teeth, claws, horns, spikes and clubs--dinosaurs had the most impressive armament of any creatures that ever lived. Here's how raptors, tyrannosaurs, ankylosaurs and other kinds of dinosaur wielded their weapons, and why they fought each other in the first place.
Teeth, claws, horns, spikes and clubs--dinosaurs had the most impressive armament of any creatures that ever lived. Here's how raptors, tyrannosaurs, ankylosaurs and other kinds of dinosaur wielded their weapons, and why they fought each other in the first place.
Pterodactylus
The first pterosaur ever to be discovered--and still the most famous.
The first pterosaur ever to be discovered--and still the most famous.
Dino-WHAT?
Dinosaurs weren't the only animals to grow to huge sizes in prehistoric times. Here's a list of assorted amoebas, rats, parrots and beavers that outclassed their contemporaries.
Dinosaurs weren't the only animals to grow to huge sizes in prehistoric times. Here's a list of assorted amoebas, rats, parrots and beavers that outclassed their contemporaries.
Alioramus
All we know of this tyrannosaur is based on a single skull.
All we know of this tyrannosaur is based on a single skull.
Troodon
Possibly the smartest dinosaur that ever lived.
Possibly the smartest dinosaur that ever lived.
Pterodactyl Facts
When most people say "pterodactyl," they're usually referring to one of two genuses of pterosaur, Pterodactylus or Pteranodon. Here are 10 facts you may or may not have known about these flying reptiles.
When most people say "pterodactyl," they're usually referring to one of two genuses of pterosaur, Pterodactylus or Pteranodon. Here are 10 facts you may or may not have known about these flying reptiles.
Archaeopteryx
This ancient, flying dinosaur was about the size of a modern pigeon.
This ancient, flying dinosaur was about the size of a modern pigeon.
Bambiraptor
Yes, this tiny raptor was named after you-know-who.
Yes, this tiny raptor was named after you-know-who.
Ornithopods
Ornithopods--small- to medium-sized, mostly bipedal herbivores--were among the most common dinosaurs, roaming the plains and woodlands of the Mesozoic Era in vast herds. Here's what we currently know about these gentle plant-eaters, along with a list of notable genuses.
Ornithopods--small- to medium-sized, mostly bipedal herbivores--were among the most common dinosaurs, roaming the plains and woodlands of the Mesozoic Era in vast herds. Here's what we currently know about these gentle plant-eaters, along with a list of notable genuses.
Dimetrodon
This ancient synapsid had a giant sail on its back.
This ancient synapsid had a giant sail on its back.
Allosaurus Facts
Allosaurus was one of the most common carnivorous dinosaurs of the Jurassic period. Here are 10 facts you may or may not have known about this agile hunter.
Allosaurus was one of the most common carnivorous dinosaurs of the Jurassic period. Here are 10 facts you may or may not have known about this agile hunter.
Eoraptor
This tiny dinosaur was among the first of its kind.
This tiny dinosaur was among the first of its kind.
Cryptoclidus
A classic, sleek, long-necked plesiosaur.
A classic, sleek, long-necked plesiosaur.
Diplodocus
"Thin at one end, much much thicker in the middle, and then thin again at the far end."
"Thin at one end, much much thicker in the middle, and then thin again at the far end."
Stegosaurs
Stegosaurus may be the most famous example, but at least a dozen other genuses of stegosaur lived during the Jurassic and early Cretaceous periods. Here's everything you need to know about these plated, spiked, four-footed plant-eaters.
Stegosaurus may be the most famous example, but at least a dozen other genuses of stegosaur lived during the Jurassic and early Cretaceous periods. Here's everything you need to know about these plated, spiked, four-footed plant-eaters.
Tyrannosaurus Rex
Pictures, illustrations and photographs of Tyrannosaurus Rex, the world's most popular dinosaur.
Pictures, illustrations and photographs of Tyrannosaurus Rex, the world's most popular dinosaur.
Jeholopterus
Pictures, illustrations and photographs of various pterosaurs, ranging from Anurognathus to Zhejiangopterus.
Pictures, illustrations and photographs of various pterosaurs, ranging from Anurognathus to Zhejiangopterus.
Afrovenator
One of the few carnivores ever to be dug up in north Africa.
One of the few carnivores ever to be dug up in north Africa.
Alectrosaurus
Few specimens of this "unmarried lizard" have been found.
Few specimens of this "unmarried lizard" have been found.
Carnotaurus
The shortest arms of any meat-eater--and horns to match.
The shortest arms of any meat-eater--and horns to match.
Stegosaurus Facts
Stegosaurus is one of the most familiar dinosaurs of the Cretaceous period, but how much do you really know about this plated lizards? Here are 10 facts you may or may not have known about Stegosaurus.
Stegosaurus is one of the most familiar dinosaurs of the Cretaceous period, but how much do you really know about this plated lizards? Here are 10 facts you may or may not have known about Stegosaurus.
Triceratops Facts
It's impossible to mistake Triceratops for any other dinosaur--but very possible to hold some mistaken notions about this ancient beast. Here are 10 things you may (or may not) have known about Triceratops.
It's impossible to mistake Triceratops for any other dinosaur--but very possible to hold some mistaken notions about this ancient beast. Here are 10 things you may (or may not) have known about Triceratops.
Pyroraptor
This "fire thief" prowled the plains of prehistoric France.
This "fire thief" prowled the plains of prehistoric France.
Luis Alvarez
He discovered the reason dinosaurs went extinct.
He discovered the reason dinosaurs went extinct.
Dinosaur Classification
How do paleontologists classify long-extinct dinosaurs? Here's a quick guide to the major orders, suborders and infraorders of dinosaurs, according to the state of current research.
How do paleontologists classify long-extinct dinosaurs? Here's a quick guide to the major orders, suborders and infraorders of dinosaurs, according to the state of current research.
Iguanodon
Only the second dinosaur in history ever to receive a name.
Only the second dinosaur in history ever to receive a name.
Dilong
This "emperor dragon" may have been an ancestor of T. Rex.
This "emperor dragon" may have been an ancestor of T. Rex.
Dromiceiomimus
Possibly the fastest dinosaur that ever lived.
Possibly the fastest dinosaur that ever lived.
Smilodon
Pictures, illustrations and photographs of saber-toothed cats, ranging from Dinictis to Xenosmilus.
Pictures, illustrations and photographs of saber-toothed cats, ranging from Dinictis to Xenosmilus.
Ichthyosaurus
A remarkably fish-like reptile of the Jurassic period.
A remarkably fish-like reptile of the Jurassic period.
Dinosaur Children
Until recent discoveries of ancient nesting grounds, paleontologists knew virtually nothing about how (or even if) dinosaurs cared for their young. Here's a look at the current state of though about dinosaur child rearing.
Until recent discoveries of ancient nesting grounds, paleontologists knew virtually nothing about how (or even if) dinosaurs cared for their young. Here's a look at the current state of though about dinosaur child rearing.
Dilophosaurus
This dinosaur was distinguished by the bony crests on its noggin.
This dinosaur was distinguished by the bony crests on its noggin.
Giganotosaurus Facts
Giganotosaurus is rapidly gaining on T. Rex as the most popular carnivorous dinosaur. Here are 10 facts you may or may not have known about this terrifying hunter.
Giganotosaurus is rapidly gaining on T. Rex as the most popular carnivorous dinosaur. Here are 10 facts you may or may not have known about this terrifying hunter.
Suchomimus
A fish-eater with a distinctly crocodilian profile.
A fish-eater with a distinctly crocodilian profile.
Silly Extinct Dinosaurs
We all know about dinosaurs like T. Rex and Stegosaurus that met their doom 65 million years ago, during the K/T Extinction. But what about the lesser-known dinos that appeared briefly during the Mesozoic Era, only to quickly disperse into the mists of history?
We all know about dinosaurs like T. Rex and Stegosaurus that met their doom 65 million years ago, during the K/T Extinction. But what about the lesser-known dinos that appeared briefly during the Mesozoic Era, only to quickly disperse into the mists of history?
Dromaeosaurus
This "running lizard" was probably covered with feathers.
This "running lizard" was probably covered with feathers.
Mesohippus
This "middle horse" was about the size of a deer.
This "middle horse" was about the size of a deer.
Robert Bakker
A forceful believer in warm-blooded dinosaurs.
A forceful believer in warm-blooded dinosaurs.
Plesiosaurus
This long-necked swimmer set the standard for aquatic reptiles.
This long-necked swimmer set the standard for aquatic reptiles.
Stomatosuchus
Pictures, illustrations and photographs of prehistoric crocodiles, ranging from Bernissartia to Stomatosuchus.
Pictures, illustrations and photographs of prehistoric crocodiles, ranging from Bernissartia to Stomatosuchus.
Daspletosaurus
This "frightful lizard" was a cousin of T. Rex.
This "frightful lizard" was a cousin of T. Rex.
Compsognathus
The size of a chicken, but much meaner.
The size of a chicken, but much meaner.
Cynognathus
The most mammal-like of all ancient reptiles.
The most mammal-like of all ancient reptiles.
Tyrannotitan
We know very little about this fearsomely named dinosaur.
We know very little about this fearsomely named dinosaur.
Mosasaurus
The first giant aquatic reptile ever to receive a name.
The first giant aquatic reptile ever to receive a name.
Shantungosaurus
The biggest of all the duck-billed dinosaurs.
The biggest of all the duck-billed dinosaurs.
Therizinosaurus
What did Little Orphan Annie say when she saw this dinosaur? "Reaping lizards!"
What did Little Orphan Annie say when she saw this dinosaur? "Reaping lizards!"
Ornithomimids
Despite what you might guess from their name, ornithomimid ("bird mimic") dinosaurs didn't resemble flying birds, but landbound varieties like ostriches and emus. Here's what we know about ornithomimids, along with a list of the most notable genuses.
Despite what you might guess from their name, ornithomimid ("bird mimic") dinosaurs didn't resemble flying birds, but landbound varieties like ostriches and emus. Here's what we know about ornithomimids, along with a list of the most notable genuses.
Aardonyx
An early stage in the evolution of sauropods.
An early stage in the evolution of sauropods.
Deinosuchus
One of the biggest crocodiles of the Cretaceous period.
One of the biggest crocodiles of the Cretaceous period.
Irritator
This spinosaur was named by a very frustrated paleontologist.
This spinosaur was named by a very frustrated paleontologist.
The Origins of Flight
There are two theories about how feathered dinosaurs started to fly, which can be loosely classified as "bottom up" and "top down." Here's a look at the evidence for and against each, and the current state of thinking among paleontologists.
There are two theories about how feathered dinosaurs started to fly, which can be loosely classified as "bottom up" and "top down." Here's a look at the evidence for and against each, and the current state of thinking among paleontologists.
Styracosaurus
Winner of the "most elaborate head display" competition.
Winner of the "most elaborate head display" competition.
Ceratosaurus
This primitive carnivore is hard for paleontologists to classify.
This primitive carnivore is hard for paleontologists to classify.
Seismosaurus
It was huge, to be sure--but might it have been a species of Diplodocus?
It was huge, to be sure--but might it have been a species of Diplodocus?
Californosaurus
Guess what state this ichthyosaur was discovered in?
Guess what state this ichthyosaur was discovered in?
Tarbosaurus
Pictures, illustrations and photos of various tyrannosaurs, ranging from Albertosaurus to T. Rex.
Pictures, illustrations and photos of various tyrannosaurs, ranging from Albertosaurus to T. Rex.
Top 5 Dino Movies
A list of the five best dinosaur movies of all time, from your About.com Dinosaur guide.
A list of the five best dinosaur movies of all time, from your About.com Dinosaur guide.
Nothosaurus
A slim, fast swimmer with lots of teeth.
A slim, fast swimmer with lots of teeth.
Pliohippus
This prehistoric horse was built for speed.
This prehistoric horse was built for speed.
Hyracotherium
The horse formerly known as Eohippus.
The horse formerly known as Eohippus.
Buitreraptor
The oldest raptor ever discovered in South America.
The oldest raptor ever discovered in South America.
Tylosaurus
A slim, sleek mosasaur of the late Cretaceous.
A slim, sleek mosasaur of the late Cretaceous.
Brachiosaurus Facts
One of the largest creatures ever to roam the earth, Brachiosaurus has become the poster lizard for huge, slow-witted sauropods. Here are 10 facts you may or may not have known about Brachiosaurus.
One of the largest creatures ever to roam the earth, Brachiosaurus has become the poster lizard for huge, slow-witted sauropods. Here are 10 facts you may or may not have known about Brachiosaurus.
Safari Dinosaur Replicas
A list of museum-quality dinosaur replicas manufactured by Safari, Ltd., and sold on Amazon.com.
A list of museum-quality dinosaur replicas manufactured by Safari, Ltd., and sold on Amazon.com.
Moschops
One of the largest therapsids before the rise of the dinosaurs.
One of the largest therapsids before the rise of the dinosaurs.