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Because it is. There's not really a "why".
If you mean "what are the characteristics of a dolphin that show that it's a mammal and not a fish or amphibian", it's warm-blooded, produces milk, and gives birth to live young.
What else can I help you with?
Is a dolphin a mammal fish or a amphibian?
A dolphin is a mammal.
Is a dolphin a fish mammal or amphibian?
A dolphin is a mammal.
Is a dolphin a fish a amphibian or a mammal?
MAMMAL
Is a dolphin a mammal reptile bird fish amphibian or other?
a dolphin is a mammal
Is a dolphina an amphibian?
No, a dolphin is a mammal, not an amphibian.
Are dolphins amphibians fish or mammals?
A dolphin is a (marine) mammal. I could see why you may have thought amphibian, however an amphibian is more of a frog/lizard species.
Is a dolphins a reptile fish or amphibian?
A dolphin is neither reptile, amphibian, or fish. It is a mammal. It comes up to the surface of the water to breathe air through it's blowhole.
Is the dolphin classifield as a fish and amphibian or mammal?
Dolphins are classifiedas mammals. They give birth to live young.
Is a dolphin a mammal a reptile a insect or a amphibian?
It's a mammal
Is dolphin and amphibian the same?
No, dolphins are in the mammal category
Is a dolfin a fish?
A "dolphin" is a mammal.
Is a dolphin a fish amphibians or a mammal?
A dolphin is a mammal.
