How does the kangaroos reproductive system work?

Females have two lateral vaginas, which lead to separate uteruses, but both open externally through the same orifice. A third canal, the median vagina, is used for birth. This canal can be transitory or permanent.[13] The males generally have a two-pronged penis, which corresponds to the females' two vaginas.[14] The penis is used only for discharging semen into females, and there is instead a urogenital sac used to store waste before expulsion