46 · F O R T Y- S I X What are mammals and birds like? MAMMALS are viviparous. They are born from their mother’s womb and drink their mother’s milk. Most of them are covered with fur. Most of them have four legs. They use them to walk and run. They have teeth. BIRDS are oviparous. They are born from eggs. They are covered with feathers. They have two wings. Most birds use them to fly. They have two feet to walk or swim. They have a beak. Some mammals live in water. They use fins to move. Bats are the only mammals that have wings. BIRD MAMMAL OVIPAROUS VIVIPAROUS WORD BANK beak
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