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.


With a thigh bone over seven and a half feet long, longer than any other femur known is antarctosaurus was a sauropod of spectacular proportions. Find out more about this and other Late Cretaceous dinosaurs.

Aralosaurus is from Kazakhstan in the Soviet Union. It is known only from a nearly complete skull that is missing the front of the snout and all of the lower jaw, but no skeleton. Learn more about this Late Cretaceous duckbilled dinosaur.

In 1893, British paleontologist Richard Lydekker published the first description of sauropod dinosaurs from South America that had been unearthed in Patagonia is argentina. One of these was the Argyrosaurus. Learn more about this Late Cretaceous dinosaur.

Arrhinoceratops is a rare ceratopsian known from only one skull that lacks a lower jaw. This single specimen was found in 1923 along the Red Deer River of Alberta by an expedition from the University of Toronto. Learn more about this Late Cretaceous dinosaur.

This carnivorous dinosaur was named more than one hundred years ago for an unusual tooth found in the Judith River Badlands of northern Montana. When it was discovered, much of the West was still wild. Learn more about this Late Cretaceous dinosaur.

Avaceratops lammersi was a small ceratopsid known from a single skeleton found in the Judith River Formation of Montana in 1981. Learn more about the Avaceratops and other Late Cretaceous dinosaurs.

Avimimus ('bird mimic') was a small, lightly built theropod from the Upper Cretaceous Djadokhta Formation of Mongolia. Learn more about the Avimimus and other Late Cretaceous dinosaurs.

Bactrosaurus ("reptile from Bactria") is known from many skull and skeletal pieces, but not a complete skeleton. Learn more about the Bactrosaurus and other Late Cretaceous dinosaurs.

Bagaceratops rozhdestvenskyi was a small protoceratopsian with a big name: "baga" is the Mongolian word for "small," "ceratops" means "horned face," and the species name is in honor of Russian paleontologist A. K. Rozhdestvensky. Learn more about Late Cretaceous dinosaurs.

Brachyceratops montanensis was found in 1913 by paleontologist Charles W. Gilmore on the Blackfeet Indian Reservation in Montana. Learn more about the Brachyceratops, Late Cretaceous dinosaurs and dinosaurs of all eras.

One of the most unusual duckbilled dinosaurs in the Late Cretaceous was Brachylophosaurus ("short-ridged reptile"). This hadrosaurid was discovered and named by Charles Sternberg of Ottawa, Canada, in 1953. Learn more about the Brachylophosaurus.

Centrosaurus, which means "sharp-point reptile," was named by Lawrence Lambe in 1902 from specimens found along the Red Deer River in Alberta. A number of complete skulls and skeletons have since been discovered. Learn more about the Centrosaurus.

The first Chasmosaurus fossil found was part of the neck frill. It was unearthed in 1898 by Lawrence Lambe along the Red Deer River is alberta. Learn more about the Chasmosaurus and other Late Cretaceous dinosaurs.

The oviraptorids were peculiar theropods. Smallish, bipedal animals with strong beaks, they may have fed on mollusks by crushing their shells to get the soft meat inside. Learn more about the Conchoraptor is an oviraptorid is and other Late Cretaceous dinosaurs.

Corythosaurus, the "corinthian helmet reptile," was one of the most abundant duckbilled dinosaurs from the Late Cretaceous of western North America. Originally found and named by Barnum Brown of the American Museum of Natural History, Corythosaurus is also one of the best known of all dinosaurs.

With its massive head and large teeth, there is no question that Daspletosaurus was master of its world. It got its name because of its ferociousness; its name means "frightful reptile." Learn more about the Daspletosaurus and other Late Cretaceous dinosaurs.

Deinocheirus ("horrible hand") is a fascinating animal. Its front arms and three-fingered hands are nearly eight feet long. Learn more about the Deinocheirus, Late Cretaceous dinosaurs and dinosaurs of all eras.

A recently named armored dinosaur, Denversaurus is based on a badly crushed skull from South Dakota. No other parts of the skeleton have been found, so it is difficult to estimate how long or heavy the animal was. Learn more about the Denversaurus.

In 1914, Barnum Brown of the American Museum of Natural History collected a nine-inch-long skull and some foot bones from the Judith River Formation in Alberta. It was named Dromaeosaurus, which means "running reptile." Learn more about the Dromaeosaurus.

Dromiceiomimus ("emu mimic") has been found both in the Late Cretaceous Horseshoe Canyon and the Judith River Formation of Alberta. It is very similar to Struthiomimus and Ornithomimus, but had much larger eyes and longer, more slender arms. Learn more about the Dromiceiomimus.

Dryptosaurus is the only carnivorous dinosaur from the East Coast of the United States based on more than a single bone. The partial skeleton was discovered more than a hundred years ago by workers in a quarry in New Jersey. Learn more about the Dryptosaurus.

Edmontonia would not have made an easy meal for a hungry tyrannosaur. It had a heavily armored body and large, forward-pointing shoulder spines. Learn more about Edmontonia, Late Cretaceous dinosaurs and dinosaurs of all eras.

Edmontosaurus was one of the largest hadrosaurids. This flat-headed duckbilled dinosaur was originally found, described is and named by Lawrence Lambe in 1920. Learn more about the Edmontosaurus and other Late Cretaceous dinosaurs.

The Joint Polish-Mongolian Paleontological Expeditions of the 1960s produced many new kinds of dinosaurs, many of which were small theropods. One of these theropods was a Elmisaurus. Learn more about Elmisaurus.

In 1980 is altangerel Perle named Erlikosaurus andrewsi after the demon Erlik from Mongolian mythology and paleontologist Roy Chapman Andrews. It was closely related to Segnosaurus. Learn more about the Erlikosaurus.