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Here's a beach at night. The sand starts to move, and out crawl tiny turtles, dozens of them, racing for the sea.

No mother turtle is anywhere near, and yet here they all are. So how did they begin?

Look at how they move, too. Each one has wide, flat flippers, not feet. Why flippers?

And every single turtle heads straight for the water, in the dark, as if it knew which way the sea was.

That's what this topic is about: how baby animals begin, what their body parts do for them, and how animals notice the world around them.

Okay, so are you ready to look closely at how animals live?

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