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Did you know that a frog can stop its heart from beating? Or that an elephant's tooth is heavier than a brick? Or that the brain of an ostrich is smaller than its eyeball?

In this book, there are 21 cross-sections that show how skeletons, organs, nerves, and muscles fit together inside creatures from across the globe. Animals can have some body parts in common with us humans, such as the brain, heart and lungs—but each creature has its own unique body to help it survive and thrive in the wil...