Dinosaurs

1. Dinosaurs are prehistoric reptiles that have lived on Earth million of years ago. The word dinosaur means a terrifying lizard.

2. Dinosaurs come in all shapes and sizes but scientists separate species into two major

groups, Saurischia and Ornithischia.

3. Some weighed as much as 80,000 kilograms and were more than 36 meters long.

4. Many dinosaur skulls had big holes that both made them lighter and helped them to keep

them cooler.

5. The dinosaur with longest name is the 23 letter Micropachycephalosaurus which was found

in China.

6. Meat-eaters walked on two legs and hunted alone or in groups.

7. Plant-eaters walked on either two or four legs.

8. Most dinosaurs hatch from eggs and they could not fly or live in water.

9. Some dinosaurs had horns and spikes, others had thick bumpy skin, and some even had

feathers.

10. It is believed that the dinosaurs became extinct due to climate and geological changes that

interrupted the dinosaurs' food supply.