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Mammals have a number of characteristics that make them mammals. Firstly, they are chordate animals possessing vertebrae. But that take us down to all vertebrates; beyond that the mammalian features are

1. Females have mammary glands

2. Unique Sweat Glands (only mammals have)

3. Presence of Hair and/or Fur

4. Three middle ear bones

5. Presence of Neocortex in brain

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15y ago

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