Female kangaroos have two vaginas and two uteruses. They also have a third canal that is used solely for birth.

Female kangaroos have 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 kangaroos have two fallopian tubes and two cervixes. This is a feature of all marsupials, not just kangaroos. Wombats, koalas, possums and opossums, Tasmanian devils, quolls, wallabies - the females all have two sets of reproductive structures.

Like most marsupials, male kangaroos, with the exception of the largest species, the Red, Eastern Grey and Western Grey, have a two-pronged penis to accommodate the females' two vaginas.