Why is a shark a mammal?
Sharks are fish, even though some people believe they are mammals due to how big some of them can get and because some give birth to live young. Fish are aquatic animals that were among the first vertebrates (animals with a backbone) to evolve on earth.
Which fish is a mammal?
Whales and porpoises are also mammals. There are 75 species of dolphins, whales, and porpoises living in the ocean. They are the only mammals, other than manatees, that spend their entire lives in the water.
What is a shark classified as?