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Most marsupials are characterised by a pouch, but not all of them are. The numbat, for example, is a marsupial without a pouch.

However, all marsupials are characterised by the fact that the young are born extremely undeveloped, and must find their way to the mother's teat which then swells in the young joey's mouth, attaching it firmly in place while it continues its development - either inside a pouch, or clasping the mother's underbelly.

Female marsupials have two vaginas, or what are called paired lateral vaginae. These are for the purpose of transporting the sperm to the womb, but there is a midline pseudovaginal canal for actually giving birth. As well as two vaginas and two uteruses, female marsupials have two fallopian tubes and two cervixes. Most male marsupials, with the exception of the largest species, the Red Kangaroo, Eastern Grey and Western Grey Kangaroos, have a "bifurcated" or two-pronged penis to accommodate the females' two vaginas.

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