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Science. Geology.        

fossil dinosaur skull Paleontology.
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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.
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.
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.
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.
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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