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A placental mammal is a mammal that gives birth to fully developed live young. such as like humans, for instance. It is classed within the group of animals known as eutherians.

Dogs, cats, livestock, rodents, giraffes, rhinoceroses, etc, are all placental mammals.

This is opposed to the monotremes, which are egg-laying mammals (platypuses and echidnas) or marsupials (kangaroos, koalas, wombats, etc), which give birth to very undeveloped young that must complete their development attached to a nutrient-supplying teat, usually in the mother's pouch.

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8y ago

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