They are mammals because they have lungs not gills,they have hair not scales , and they also have give live birth and don't lay eggs. There are only about 80 kinds of whales and dolphins that we know of right now. Whales Whales are very large animals. They can grow up to 100 ft. or more in length. They can weigh up to 200 tons or more.
Whales live in families called pods.
These pods vary in numbers and consist of family members and family friends. Whales live in these families their whole life. Group living is safer when other whales or sharks attack. It also makes it easier to find food. Whales are always migrating.