What is fish, why isn't dolphin fish

Fish is a vertebrate animal that lives with breaths under water and usually makes egg reproduction. According to the researches, there are 40,000 kinds of fish species.

Yunus, contrary to what is known, is a marine mammal other mammals; seal, water stallion, whale, sea bear.

The creatures that give birth to the birth of the cub, not with eggs, are called mammals.