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They are warm-blooded and mothers make milk for thie young. All mammals have fur somewhere on their bodies, and the females of all mammal species have mammary glands with which they feed their young with milk. These are the two defining features of mammals. Most mammals give birth to live young, but the five species of monotremes (which have the above two characteristics) lay eggs instead.
Wiki User
∙ 8y ago
Wiki User
∙ 14y agoMost mammals share two characteristics.
1. They have hair.
2. They feed their young with mammary gland milk.
Wiki User
∙ 11y agoThey have hair and can produce milk for their young
Wiki User
∙ 11y agothey have hair and produce milk for their young
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∙ 14y agoTwo features that every mammal has in common are that they have hair, and they give birth to live young.
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∙ 8y agoMammals are different from other types of animals because they are warm-blooded and give live birth to their young (with the exception of the platypus). Most also have hair or fur.
Wiki User
∙ 6y agoThe answer is hair and mammary glands.
Wiki User
∙ 11y agoWarm blooded and produce milk for young.
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