What Makes a Mammal?

Answer

The feature most commonly used to identify a mammal is the presence of bodily hair, as that is the most obvious, but not the only, indicator. Mammals are warm-blooded animals with an outer covering of skin and hair to help regulate their temperature and protect their organs. Female mammals also possess mammary glands(the name 'mammal' comes from these glands), so that they can produce milk with which they may feed their children.
1 Additional Answer
Mammals are designated by the fact that they lactate to feed their young, carry their young internally during pregnancy, and has a fur or fur-like covering.
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