What is a mammal and what are its distinguishing characteristics?
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Mammals are vertebrates and are warm blooded animals. They have different characteristics that are far apart from other animal species. The unique feature of the mammal's family is that they feed their young ones with their milk produced by the mammary gland.
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(i) Presence of mammary glands in females to nourish the young ones.
(ii) Body covered with hair.
(iii) External ear pinna present.
(iv) Heart is four-chambered.
(v) They are homoiothermous.
(vi) They are viviparous except platypus and spiny ant-eater.
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