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Marsupials and monotremes are mammals. These creatures all feed their young on mothers' milk.

If the question means what is the difference between placental mammals (eutherians) and marsupials and monotremes, that is another matter. The essential difference between all of the groups is that placentals nurture their developing young via the placenta inside the female's body.

Most marsupials (not all) have a pouch, or marsupium, low down on their abdomen into which the newborn, undeveloped joey crawls after birth to continue its development. Monotremes, on the other hand, are egg-laying mammals.

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12y ago

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