What makes a mammal, a mammal are the several characteristics that particular animal has. For instance, all mammals have hair, as well as fat glands and sweat glands, female mammals also have mammary glands. All mammals are vertebrates and also have several types of teeth. Therefore, dolphins would not be classified as fish, they would be classified as mammals since they not only breathe air into their lungs, they have hair at some point during their life cycles, are warm blooded creatures, give birth to live young, and also nurse them with their mammary glands.
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