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Mammals that retain their young within the body of the mother for a long period of time are called?
Wiki User
∙ 14y ago
Placental mammals retain their young within the body of the mother for a long period of time. Humans, dogs, bears, and mice are all examples of placental mammals.
Mammals which do not retain their young for a long period of time are marsupials, all of which have short gestation periods (e.g. kangaroos, koalas, Tasmanian devils, wombats, etc) and monotremes (platypuses and echidnas), which are egg-laying mammals.
Wiki User
∙ 14y ago
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