Doplphins are mammals. They breathe through lungs and have hair on their body for at some of their live. They also have internal fertilization.
No, not all animals have lungs, fish and reptiles have gills, humans and mammals have lungs except whales and dolphin they have gills because they under water
Beluga whales are considered mammals because they have the characteristics of (almost all) mammals: live birth, suckle their young, etc
mammals
Plainly and simply, no... other than whales.
Whales are mammals and must breath air. If they cannot reach the surface to breath they will drown.
I hope you mean under water. And yes they can. Some mammals even live under water, like a dolphin, whale or seal.
No, they must surface to breathe, as they have lungs like all mammals.
Cetaceans, which is further split into Mysticeti, baleen whales, and Odontoceti, toothed whales, which includes dolphins, killer whales, and porpoises
The last I heard Mammals are classified under mammals. Warm blooded, give birth to live young, suckle them.
It is beacouse of their blowholes
An orca is a species of dolphin. It is in the group Delphinidae a group of oceanic dolphins. The orca is only called a killer whale because it has been seen killing other whales not because it is a whale :)
Yes, whales are mammals and their entire life is spent under water. Though sometimes they come over water like in the old movie, Free Willy