Both share in common one habit unique to monotremes: egg-laying. Platypus are semi-aquatic creatures and echidna are land dwellers. Monotremes include only two animals that survive today: the platypus and the echidna. Marsupials and eutherians are often lumped together into a subclass known as therian mammals, but monotremes are so distinct from other mammals that they deserve their own separate category. The largest group by far are eutherians, which include animals that nurture their young in the mother's placenta (accordingly, the infraclass is sometimes referred to as " placentals"). Necessary background - The three main groups of mammals are: monotremes, eutherians, and marsupials. Echidna, along with platypus, compose a unique group of mammals known as monotremes. An echidna walking in a coastal wilderness area in Victoria, Australia.
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