Mammals are a group of vertebrates that includes some 21 groups. These groups include animals such as anteaters, bats, carnivores, aardvarks and their relatives, cetaceans, elephants, hoofed mammals marsupials, primates, rodents and many others. There are approximately 5,400 species of mammals alive today. Mammals first appeared some 200 million years ago during the Jurassic Period.
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