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Kangaroos have three vaginas - Not Exactly Rocket Science : Not Exactly Rocket Science. 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.
It’s a truly incredible show, combining unbridled joy at the natural world, drama, and solid educational value. So far, it has brought us the horrifying throat of a leatherback turtle, the mysterious bloodsweat of a hippo, and the exploding insides of a beached whale. But this week’s episode may have topped all of that with the triple vaginas of the female kangaroo. 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. Watch Valentine`S Day Online Free HD more.
Note that the ureters, which carry urine from the kidneys to the bladder, pass through the gaps between the three tubes. Watch It Download. 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.
The programme also suggested that this might explain why marsupial embryos are born at such a premature stage of development. A kangaroo’s joey is about the size of a jellybean when it leaves the vagina, and it must endure an arduous crawl into the pouch. It’s possible that with such a narrow tube to go down, it couldn’t get any bigger before its birth. With its complicated reproductive set- up, a female kangaroo can be perpetually pregnant. While one joey is developing inside the pouch, another embryo is held in reserve in a uterus, waiting for its sibling to grow up and leave. Indeed, a mother kangaroo can nourish three separate youngsters at a time – an older joey that has left the pouch, a young one developing inside it, and an embryo still waiting to be born.