Kangaroos do not have advanced placentas, and have epipubic bones. Epipubic bones are bones which project forwards from the pelvis. In the case of marsupials, these bones support the female's pouch, but there are other mammals which are not marsupials which also have epipubic bones. The excretory and reproductive systems of placental mammals and marsupials are also different.
Female kangaroos, like other 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 kangaroo species, with the exception of the largest of the species (the Red Kangaroo, Western Grey and Eastern Grey) have a two-pronged penis to accommodate the females' two vaginas.
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