What is the difference between a whale and a fish? Yes, a whale is a mammal and a fish is not, but did you also know that a whale has sideways tail fins while a fish’s fins run up and down? That’s why when a whale swims it swings its body up and down, and when a fish swims, it moves from side to side.

Whales are mammals. They breath air, have hair, are warm blooded, and give birth to live offspring that suckle milk from their mothers Mammary Glands, glands that produce milk, which all mammals have.

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