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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 Inside Nature’s Giants, the British documentary where anatomists cut up large animals to examine how their bodies work and evolved.

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Koalas, wombats and Tasmanian devils all share the three-vagina structure.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. The programme also suggested that this might explain why marsupial embryos are born at such a premature stage of development.Supernumerary nipples are located along the embryonic milk lines.Ectopic supernumerary nipples are found beyond the embryonic milk lines.

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