Mammals are animals that are warm-blooded. Most mammals have hair. Many mammals have lots of hair. Most mamals do not lay eggs. Their babies are born alive. Lions and horses are mammals. People are mammals too. All of those mammals live on land. Some mammals live in the water. Dolphins and whales are mammals. They live in the water. A few mammals live on land. But they live in the water too. The seal and the beaver are mammals. They live in the water. They live on land too. One mammal can fly. Bats are mammals. Bats can fly.