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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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Pachycephalosaurus

The largest pachycephalosaur was Pachycephalosaurus. First found in rocks of Late Cretaceous age in Montana, Pachycephalosaurus was named and described by Barnum Brown and Eric Schlaikjer. Learn more about the Pachycephalosaurus.

Pachyrhinosaurus

Pachyrhinosaurus was probably the most unusual and distinctive ceratopsid. It did not have brow or nasal horns; instead it had a thick, bumpy, spongy pad of bone along the upper surface of its flattened face. Learn more about the Pachyrhinosaurus.

Panoplosaurus

Panoplosaurus is known only from two partial skeletons, one of which preserves some of the armor the way it was in life. This skeleton shows that Panoplosaurus was unusual among nodosaurids because it did not have spikes on the sides of its neck.

Parasaurolophus

Parasaurolophus was an interesting-looking dinosaur. While it looked normal from the neck down, it looked almost as if it had a trombone on its head. And in a way, it did.

Parksosaurus

Not many fossils of Parksosaurus have been found. It is known only from a single skeleton and poorly preserved skull from the southern part of Alberta. Learn about Parksosaurus, Late Cretaceous dinosaurs and dinosaurs of all eras.

Pentaceratops

Known only from the Late Cretaceous of northwestern New Mexico, Pentaceratops had one large horn on its snout is a pair of large horns above its eyes is and a pair of much smaller false horns in the cheek region. Its name means "five-horned face." The horns were actually bone.

Pinacosaurus

Pinacosaurus was one of the first armored dinosaurs found in Asia. An expedition from the American Museum of Natural History went to Mongolia to search for traces of early man; instead they found dinosaur eggs and skeletons.

Prenocephale

An almost complete skull and most of the skeleton were found for Prenocephale. It was collected during the Joint Polish-Mongolian Expeditions to the Gobi Desert. The animal was named and described in 1974.

Prosaurolophus

Prosaurolophus was a common duckbilled dinosaur that lived during the Late Cretaceous in North America. It was discovered, named is and described by Barnum Brown of the American Museum of Natural History in 1916.

Protoceratops

Protoceratops andrewsi was discovered in Mongolia in 1922 by an expedition from the American Museum of Natural History led by Roy Chapman Andrews. Its genus name means "first-horned face," and its species name was in honor of the expedition's leader.

Saichania

Saichania was described from a partial skeleton with the armor preserved the way it was when the animal was alive. Learn more about the Saichania and other Late Cretaceous dinosaurs.

Saltasaurus

From Salta in Argentina, Saltasaurus was described from several incomplete skeletons, none of which were found with a skull. This medium-size sauropod was dwarfed by its giant relative Antarctosaurus is also from South America.

Saurolophus

Saurolophus ("ridged reptile") was a hadrosaurid. It had a large bony spike pointing back over the top of its head between its eyes. Learn more about the Saurolophus and other Late Cretaceous dinosaurs.

Sauroornithoides

Discovered during an expedition by the American Museum of Natural History, Saurornithoides is an example of a birdlike dinosaur. It looked much like a bird. It was found close to where two other birdlike dinosaurs (Velociraptor and Oviraptor) were also discovered.

Segnosaurus

Segnosaurus galbinensis, or "slow lizard from Galbin" (a region of the Gobi Desert), was first described by Mongolian paleontologist Altangerel Perle in 1979. It was an unusual saurischian that he classified in its own family, the Segnosauridae.

Shamosaurus

Shamosaurus is one of the oldest known ankylosaurs. It lived about the same time as the nodosaur Sauropelta. Learn more about the Shamosaurus and other Late Cretaceous dinosaurs.

Shanshanosaurus

The paleontological expeditions into the Turpan Basin in 1964-1966 turned up several interesting and unusual dinosaurs, ilncuding the Shanshanosaurus huoyanshanensis. Learn more about the Shanshanosaurus and other Late Cretaceous dinosaurs.

Shantungosaurus

Shantungosaurus may have been the largest hadrosaur. It is larger than some of the smaller sauropods. Named and described in 1973, Shantungosaurus is known from many disarticulated (not joined) bones from the Shandong Province, People's Republic of China.

Spinosaurus

In 1912 is a German paleontological expedition discovered the remains of several new Late Cretaceous dinosaurs in Egypt. Spinosaurus is a large theropod, was one of the new dinosaurs. It got its name, which means "spined reptile," because of the tall spines on its vertebrae (bones of the spine).

Stegosaurus

No dinosaur has been the subject of as much controversy as Stegosaurus, the armored dinosaur of the Late Jurassic. For more than a hundred years, this strange plant-eater has baffled paleontologists and captured the imagination of the public.

Struthiomimus

Struthiomimus ("ostrich mimic") is the best known of all the ornithomimids. A complete skeleton, which is now displayed at the American Museum of Natural History, was collected from the Judith River Formation of Alberta. Its name points to how similar its skeleton is to the modern Struthio (ostrich).

Styracosaurus

Styracosaurus was discovered in 1913 in the Belly River Formation of Alberta by Charles Sternberg. Lawrence Lambe named this animal Styracosaurus albertensis, which means "spiked reptile of Alberta," for its unusual neck frill.

Talarurus

The Talarurus is one of the better-known ankylosaurs from Mongolia. Several partial skeletons were excavated by Soviet paleontologists during the 1950s. One of these skeletons is mounted at the Paleontological Institute in Moscow.

Tarchia

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.

Therizinosaurus

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").

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