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Science.Geology.
fossil dinosaur skull Paleontology.
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Prehistoric Life

AllosaurusAllosaurus was the biggest meat-eater in North America during the late Jurassic Period, about 154 to 144 million years ago -- up to 38 feet long and 16.5 feet tall, and weighed about 3,000 pounds.
BrachiosaurusBrachiosaurus was one of the tallest and largest dinosaurs, standing 40 to 50 feet in height, being about 85 feet in length, and weighing between 33 and 88 tons.
DaspletosaurusDaspletosaurus meaning "frightful reptile," lived in western North America during the late Cretaceous Period, about 75 million years ago. A smaller relative of Tyrannosaurus rex, Daspetosaurus averaged 35 feet in length, stood about 12 feet high, and weighed about 6000 pounds.
DiplodocusDiplodocus was one of the longer species of dinosaurs, growing as long as 90 feet and as tall as 16 feet at the hips. Its neck alone was as much as 26 feet long, and its tail was up to 45 feet long.
Edmontosaurus annectensEdmontosaurus annectens was an herbivorous dinosaur that lived across western North America during the Cretaceous Period, 71-65 million years ago.
Thescelosaurus neglectusThescelosaurus neglectus "neglected marvelous lizard," was a moderately-sized herbivorous dinosaur that roamed western North America during the late Cretaceous Period, 75-65 million years ago. It was so named because the type specimen was not described until 20 years after being found.
Tyrannosaurus rexTyrannosaurus rex means "king tyrant lizard," a name it received because of its very sharp teeth and rather fearsome appearance. The largest flesh-eating animal that has ever walked the earth, Tyrannosaurus rex was up to 40 feet long, stood about 20 feet high and weighed about 7½ tons.
MososaursMosasaurs were marine reptiles that lived in most of the world's oceans and shallow seas during the late Cretaceous Period, 70-65 million years ago. It is believed that mosasaurs were distant ancestors of the monitor lizards (such as the Komodo dragon) of today.
PterosaursPterosaurs "flying lizards," were flying reptiles that lived during the age of dinosaurs. Some were as small as sparrows, while others were as large as an airplane. They had large brains, long tails, short necks, and long, narrow wings.
RhamphorhynchusRhamphorhynchus This flying reptile had a wingspan of up to 5.75 feet. It was probably an excellent flyer, but rather clumsy on land.
Ichthyornis disparIchthyornis dispar was a remarkably bird-like animal that lived in North America during the Late Cretaceous, 95-85 million years ago. Looking much like a modern seagull, Ichthyornis was about 2 feet long and weighed about 5 pounds; it differed from all modern birds by having sharp teeth, and a combination of vertebrae similar to some modern fish.
Smilodon, aka Saber-Toothed TigerSmilodon Saber-toothed tigers are some of the best known and most popular of all Ice Age animals, but were actually more closely related to modern-day wildcats (pumas, bobcats, etc.) than to tigers.
Ground Sloths (Megatherium)Ground Sloths (Megatherium) were large relatives of the modern two-toed and three-toed sloths. The smallest species -- Shasta Ground Sloth -- was about 9 feet long and weighed up to 550 pounds (about the size of a modern black bear).
MastodonsMastodons are one of an extinct group of primitive elephants. The name mastodon originated from the fact that the grinding teeth of these animals had large nipple-shaped projections on the cross ridges.
Eohippus (Hyracotherium spp.)Eohippus (Hyracotherium spp.) Eohippus, which means "dawn horse," is considered by many to be an ancestor of modern horses. Some paleontologists, however, believe that this animal may instead have been a "cousin" rather than direct ancestor.
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This page was last updated on 07/29/2011.