Is a Whale a Fish?


Quick Answer

Whales are not considered fish. Although they resemble other animals that are considered fish, whales have a very different anatomy. Whales share many more anatomical and genetic features with another group of animals entirely: mammals.

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Full Answer

Whales may roughly resemble fish in body shape, and in that they both live in bodies of water, but whales breathe air and are incapable of directly respiring underwater as fish do. Fish generally have scales, gills and are cold-blooded. All whales have lungs, scaleless skin and are warm-blooded. Because whales are warm-blooded, give birth rather than lay eggs and suckle their young, they are considered mammals.

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