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Most scientists believe an asteroid struck Earth 66 MYA. This is what killed the dinosaurs and let other types of animals take over.
Crocodiles and alligators are hard to tell apart. One way a crocodile can often be distinguished from an alligator is by the fourth tooth on its lower jaw, which overlaps with the upper jaw. Lower teeth are hidden on an alligator.
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Making Connections
Text-to-Self
What part of the evolution of reptiles surprised you the most? Please explain your answer.
Text-to-Text
Have you read any other books about animal evolution? What did the evolution of those animals have in common with reptile evolution?
Text-to-World
There are thousands of species of reptiles in the world. With the help of an adult, look up information about your favorite reptile. Write a short paragraph explaining why it is your favorite.