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All mammals feed their young on milk. this is the defining characteristic of a mammal, as no other group in the animal kingdom has this trait.

Mammals include placental mammals (e.g. humans, rodents, stock animals, domestic pets, bears, wild canines and large cats, rabbits and hares, marine mammals such as whales, dolphins, dugongs, etc); marsupials (e.g. kangaroos, koalas, wombats, bandicoots, Tasmanian devils, etc); and monotremes(the egg-laying mammals, which include just the platypus and echidna).

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11y ago

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