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A Mammal is normally defined as a warm blooded animal with a covering of fur, skin or hair which gives birth to live young who are nourished with milk, and who are vertebrate (having a backbone). Dolphins fit all these characteristics, even though they have smooth skin instead of fur. Mammals also breathe through lungs. Dolphins must come to the surface to breathe, as they cannot breathe underwater, unlike fish.


A dolphin breathes air with lungs, is warm-blooded, and nurses its young. These are the major prerequisites for the order Mammalia. Like all mammals except the monotremes, it gives birth to live young.
They breathe air stupid.

Actually, the term 'mammal' defines an animal that produces milk to its young. The fact that they breathe air, which separates them from being fish, is coincidental but true.
Dolphins are warm-blooded air-breathing vertebrates that give birth to live young and feed them milk. Fish are cold blooded, have gills to extract oxygen from water and most lay eggs to reproduce.
Most people think that mammals are only land animals but that is not true. Dolphins are mammal because they give birth to living young, breathe air, and have hair on them. Most people suspect dolphins do not have any hair on them, but they have whiskers on the end of their nose.
Most people think that mammals are only land animals but that is not true. Dolphins are mammal because they give birth to living young, breathe air, and have hair on them. Most people suspect dolphins do not have any hair on them, but they have whiskers on the end of their nose.

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8y ago

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