Are dolphins mammals

Answer 1

Yes. Dolphins, like whales, are actually mammals. Dolphins and whales breathe air and have to surface eventually.apparently fish like mammals. They nurse their young like all other mammals. They are warm-blooded vertebrates which breathe using lungs, rather than gills, and they suckle their young.

Mammalian characters include warm-bloodedness, hair, mammary glands, 7 cervical vertebrae, and non-nucleated red blood cells.

However, there are several species of fish called "dolphinfish", which are not mammals. Probably the most famous one is the common dolphinfish, now usually called "mahi-mahi" to avoid just this confusion.

The dolphin is a mammal because it (1) has hair, (2) possess 7 cervical vertebrae (3) gives birth to live babies, (4) possess mammary glands for nursing babies.
Yes they are, as they have lungs through which they breathe as oppose to gills like fish do. They can hold oxygen in their lungs for long periods of time underwater, but like whales, they have to surface periodically to vent carbon dioxide through their blow-holes and admit fresh oxygen.

Answer 2

Yes they are mammals