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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.

Like other mammals, whales and dolphins have hair for at least part of their lives. Before birth, baby dolphins have whiskers along their snouts. After they are born, the hairs fall out. Unlike dolphins, humpback whales have hair throughout their lives. Scientists believe they use these hairs to sense water temperature and quality.

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Making Connections

Text-to-Self

What part of the evolution of mammals 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 mammal evolution?

Text-to-World

There are thousands of species of mammalsin the world. With the help of an adult, look up information about your favorite mammal. Write a short paragraph explaining why it is your favorite.

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