Earliest dinosaurs It was a small twolegged animal and thought to be a fast runner

Fabrosaurus was about a foot tall and three feet long. Many of today's dogs are larger than this prehistoric creature.

Ostrich Anatomy

G allimimus looked like an ostrich, but with arms instead of wings. Like the ostrich, Gallimimus ran as fast as a racehorse.

Gallimimus held its tail straight out for balance when it walked or ran.

It had a beak with no teeth, just as birds do today.

Earliest Dinosaurs

H errerasaurus is one of the oldest-known dinosaurs. This early meat eater was an ancestor of Tyrannosaurus rex. It used its many sharp teeth to devour lizardlike creatures.

Herrerasaurs grew up to 18 feet long. Each of its arms had three long, curved fingers, and two smaller, stubby ones.

The First Iguanodon

Iguanodon had spikes on its front limbs where other animals have thumbs. But the first Iguanodon fossil was found with only one unattached spike. Scientists thought it belonged on the end of the dinosaur's nose, like a rhinoceros's horn.


Janenschia was part of a group of long-necked plant eaters called Titanosaurs. These animals could move their tails easily in all directions.

Titanosaur Skull

Janenschia was able to eat leaves from high up on trees, making good use of its long neck. It spent most of its waking time eating.

I^-entrosaurus, like its cousin Stegosaurus, could swing its spiky tail as a weapon when it was in danger.

Kentrosaurus had a sharp beak for biting off plants, and lots of sharp spikes to protect itself from meat-eating dinosaurs.

Tiny Spikes Animal

X ieptoceratops was a tiny, distant cousin of Triceratops. Since its front legs were so much shorter than its back legs, some scientists think it may have run on its long hind limbs.

Leptoceratops was a small dinosaur. When it was fully grown, it measured only six feet long and weighed about 120 pounds.

M aiasaura mothers laid their eggs in nests built of leaves and other plant matter. They brought food to their babies and protected them until they were big enough to leave the nest.

^^^anotyrannus was a small-size cousin to Tyrannosaurus rex. It was a meat eater and an excellent hunter.

Nanotyrannus had lots of sharp teeth and excellent vision. These helped make it a dangerous hunter.

(O)viraptor fossils have been found near ancient seashores. They probably caught and ate crabs and other kinds of shellfish. Oviraptors also may have eaten eggs stolen from dinosaur and reptile nests.

entaceratops males fought to see which one was strongest. They locked their huge horns and pushed and shoved at each other. But they usually stopped before either one was badly hurt.

^^mesitosaurus was related to the giant American plant eaters. Its cousins include Apatosaurus (you may know it as Brontosaurus) and Diplodocus.


Scientists have been able to find only one Quaesitosaurus skull, but they have determined that the dinosaur was a large, long-necked plant eater.

Flying Dinosaur Plant Eaters

Ri ojasaurus walked on four legs, but its long neck made it easy for this dinosaur to eat leaves from high in the trees. At times it may have stood on its rear legs and tail to reach food.

a small head. But its most interesting feature was its teeth. This plant eater had sharp fangs, just like a meat eater.

C-Jtegosaurus had triangular back plates, along with spikes on its tail, which probably served as good protection.

JLyrannosaurus was the greatest of all meat eaters. Scientists cannot agree on how this dinosaur captured its prey. Some believe it ran fast and chased down other animals. Others think the Tyrannosaurus rex may have moved slowly and eaten animals that were already dead.

This monster dinosaur's head was four and a half feet long, and the daggerlike teeth in its huge mouth were each half a foot long.

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