Dinosaurs

It isn't hard to imagine the world full of dinosaurs, even though these extinct animals haven't walked the earth for millions of years. Learn all about dinosaurs, including early dinosaur discoveries, dinosaur fossils, and dinosaur extinction.

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This ankylosaur is known from two species. Tarchia giganteus is known from a complete skull and a partial skeleton. But, except for the skull, little of the material has been described. Learn more about the Tarchia and other Late Cretaceous dinosaurs.

By the Editors of Publications International, Ltd.

In 1948, several giant claw bones were found by a Soviet-Mongolian scientific team and because the shape of the claws is similar to the claws of some turtles, workers first thought they belonged to a giant turtle, so the specimen was named Therizinosaurus cheloniformis ("turtlelike scythe reptile").

By the Editors of Publications International, Ltd.

The first two Torosaurus specimens were a pair of skulls found in Wyoming in 1891 by John Bell Hatcher. They were described by Othniel Marsh later that same year. These two skulls were named Torosaurus latus and Torosaurus gladius.

By the Editors of Publications International, Ltd.

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Troodon was described in 1856 by Joseph Leidy on the basis of a single small tooth. It was one of the first North American dinosaurs described. Learn more about the Troodon and other Late Cretaceous dinosaurs.

By the Editors of Publications International, Ltd.

The Velociraptors in "Jurassic Park" were roughly the size of humans. In reality, they were about the size of an average turkey.

By Mark Mancini

Types of dinosaurs include the lizard-hipped dinosaurs and the bird-hipped divisions of dinosaurs. Both of these types of dinosaurs probably shared a common ancestor during the Middle Triassic. How else are these dinosaurs related?

Dinosaur bones are all we have to study what these animals looked like and how they lived. Some of the most important dinosaur bones that paleontologists study come from the skull. Why is the skull so important?

By the Editors of Publications International, Ltd.

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Anchisaurus was one of the first North American dinosaurs described. The first skeleton was found in 1818 and was originally mistake for human fossils. What did this early dinosaur look like and how did it live?

By the Editors of Publications International, Ltd.

Barapasaurus is named for a word meaning "big leg" in a local dialect in central India. This large dinosaur was a herbivore with large flat teeth that are ideal for cutting or crushing vegetation. What did this dinosaur look like?

By the Editors of Publications International, Ltd.

One of the most unusual predators is that of Coelophysis. It was only slightly larger than a turkey and had a long slender tail and a mouth full of knife-edged teeth. What was this dinosaur's behavior like?

Perhaps no other beast has been more wildly mischaracterized in popular culture than the crested predator Dilophosaurus.

By Mark Mancini

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The Herrerasaurus was a large dinosaur that weighed about 400 pounds and was about 10 feet long. It survived on a diet of small animals which it most likely caught by ambush and surprise. What else is known about this dinosaur?

By the Editors of Publications International, Ltd.

Lufengosaurus was a sauropod that measured about 20 feet in length and was a close relative of Plateosaurus. There are complete skeletons of this dinosaur, but it has not been fully described. What else is known about this dinosaur?

By the Editors of Publications International, Ltd.

Massospondylus was a medium-size prosauropod that lived in what is now modern-day North America and Africa. Its proportions suggest that it probably was able to stand up on its hind legs. What else is known about this dinosaur?

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Mussaurus was a sauropod of modest proportions. This animal is important in that it may help explain the relationship between prosauropods and sauropods. It is thought that the Mussaurus serves as a sort of missing link between the two.

By the Editors of Publications International, Ltd.

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Riojasaurus was a quadrupedal dinosaur that could not rear up on its hind legs like some of its relatives. It was a large dinosaur that measured about 33 feet in length. What are some of the other dinosaurs the Riojasaurus is related to?

By the Editors of Publications International, Ltd.

Scelidosaurus was discovered in the 19th century. At the time, it was one of the most complete dinosaur skeletons ever found. It was a heavily built plant eating dinosaur that grew to around 13 feet in length.

By the Editors of Publications International, Ltd.

Scutellosaurus was a very unusual dinosaur because it was a two-legged dinosaur that had armor. Most armored dinosaurs walked on all fours. Many scientists believe this dinosaur to be the ancestor of later larger armored dinosaurs.

By the Editors of Publications International, Ltd.

Yunnanosaurus was a long-necked, four-legged plant-eater that lived in the Early Jurassic Period. The animal was about 18-25 feet in length and lived in what is now China. What do we know about this dinosaur's behavior?

By the Editors of Publications International, Ltd.

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Stegoceras has been one of the more interesting dinosaurs, partly because of the tangle of names that have been attached to it and also because of explanations that have been attached to its domed skull.

By the Editors of Publications International, Ltd.