We interrupt your regularly scheduled news programming to bring you this wonderful piece of trivia about kangaroo genitals. Regular readers will know of my love for, the British documentary where anatomists cut up large animals to examine how their bodies work and evolved. It’s a truly incredible show, combining, drama, and solid educational value. The diagram above (an annotated screengrab from the show) explains the complicated plumbing. This set-up is shared by all marsupials – the group of mammals that raise their young in pouches. Koalas, wombats and Tasmanian devils all share the three-vagina structure. The side ones carry sperm to the two uteruses (and males marsupials often have two-pronged penises), while the middle vagina sends the joey down to the outside world. Note that the ureters, which carry urine from the kidneys to the bladder, pass through the gaps between the three tubes.
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In placental mammals, like us, the ureters develop in a different way, and don’t go through the reproductive system. As we develop, the precursors to the reproductive tubes eventually fuse into a single vagina. In marsupials, this can’t happen. You've clicked on a link that will take you outside of
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