DinosaurMillions and millions of years ago, long before there were people, dinosaurs walked the

earth. Dinosaurs were reptiles. The biggest dinosaurs were the largest animals that ever

lived on land. The smallest were about the size of a chicken.

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Plant Eaters

Most dinosaurs ate plants. These gigantic Brachiosauruses were as tall as a four-story

building and weighed as much as 15 elephants. They had long necks that allowed them to

eat leaves on high branches that other dinosaurs couldn't reach.

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Meat Eaters

Some dinosaurs survived by eating other animals, including other dinosaurs.

The Tyrannosaurus was one of the largest and most terrifying meat eaters on Earth. Its

sharp teeth and powerful jaws could easily crush bone.

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Dinosaur babies

Dinosaur babies hatched from eggs. Female dinosaurs laid the eggs in nests on the ground.

Some dinosaurs cared for their babies by feeding and protecting them until they left the

nest. Others left their young to survive on their own.

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Death of the Dinosaurs

One of the great mysteries about dinosaurs is why they became extinct, or died out,

about 65 million years ago. Many scientists think that a huge asteroid or comet from

space crashed into Earth at this very time. Dust from the crash would have blocked

sunlight and stopped plants from growing. The dinosaurs would have starved.