Respuesta :
The Platypus is a one-of-a-kind Australian species. Platypuses, like echidnas, belong to a separate transaction of mammals recognised as monotremes, that are distinguished from other mammals by the fact that they lay eggs.
The duck-billed platypus, the short-billed echidna as well as the western long-billed echidna are the only extant species of monotremes. Monotremes, like other mammals, have a segmented jaw, three bones in the middle ear, are warm blooded, as well as lactate. However, those who have retained at least some therapsid reptile characteristics, such as egg laying and the presence of a cloaca.
Even though these animals are frequently referred to that as primitive as well as ancestral, they are not all mammals' ancestors. Instead, monotremes were a very early mammalian radiation that evolved from early synapsids, that are thought to have been reptile-like mammals.
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