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The Platypus, the most well known monotreme. Monotremes are a group of mammals that form the order Monotremata. Monotremes are the only mammals that lay eggs, but they also feed their babies with milk. The word 'monotreme' refers to their common rear opening, the cloaca. In amphibia, reptiles, birds and probably all early tetrapods, there is a common opening for urine, reproduction and faeces.
Best Answer: Monotremes are not marsupials they are a distinct subgroup of mammal and contain only the echidna and platypus. The platypus is unique only to Australia but the echidna can also be found on the island of New Guinea so they also exist in Papua New Guinea and Indonesia.eport Abuse. Monotremes are unique to Australia and New Guinea. Marsupials are not unique to Australia, but most of the 140 species of Australian marsupials are not found anywhere else in the world.