Dolphins are mammals. They bear live young and use lungs to breathe air. They also have (a little)facial hair!
It's a mammal
The only thing I can imagine you are asking about is a Bottlenose dolphin, and it is a mammal.
a dolphin is a mammal
A zebra is a mammal
Mammal
A tiger is a mammal.
A tiger is a mammal.
A fly is not a mammal, reptile, or amphibian. A fly is an insect.
A greenfly is an insect.
It's an insect
Neither. A dolphin is a mammal.
insect