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They have lungs, like humans, they breathe air. They have to surface periodily to breathe, thru their blowhole on top of their heads. Fish, take in oxygen from wateer rather then air, thru therir gills. Dolphins also have live babies, unlike fish, who lay eggs. They also nurse their young, making them mammals. They have very large brains, are highly intelligent, and reason more like a human then a fish. They are mammals.
Dolphins are warm blooded, give birth to live young, feed them 'breast milk', and breathe air---not water---and therefore meet the classification as mammals (along with porpoises, whales, and bats---other animals people tend to mistake as fish or, in the case of the bat, a bird).

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9y ago

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