Whales and dolphins are mammals living in the water. The whale is also known as a fish impersonator as it is a mammal and gives birth to young ones instead of laying eggs. They breathe oxygen from air by swimming to the surface of the water and release carbon dioxide through their nostrils or blow holes into the water.

Whales breathing through blow holes

Breathing in whales

Some of the learners also asked:
How long can turtles hold their breath?