is the platypus a marsupial
Monotremes-Egg-laying Mammals. The duck-billed platypus is a monotreme which are a subfamily of mammals. They feed their young with milk, but instead of suckling from a teat, the milk simply oozes from glands under the skin, and is lapped up from a patch of fur.ther than the duck-billed platypus, there is only one other monotreme living today; a small spiny anteater called an Echidna. Monotremes, like most of the marsupials on earth are found exclusively in Australia. The platypus also possesses a number of other specializations many of which are unique to the platypi.