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By Colin Barras. Humans, meanwhile, show a variety of mating behaviours but often form monogamous couples. Michael Jensen-Seaman and Scott Hergenrother at Duquesne University in Pennsylvania think that it is the chimps — not humans — that have experimented with new sexual behaviours since our lineages diverged. But did male chimps inherit their mating plugs from the last common ancestor they shared with us or did they evolve it later? They found that the enzyme is four times as abundant in human semen as it is in chimp semen.
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Penis size: An evolutionary perspective

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VIDEO: The Five Greatest Moments in Monkey History

You've read 1 of 2 free monthly articles. Learn More. I t is a bit of a stretch, but by no means impossible or even unlikely that a hybrid or a chimera combining a human being and a chimpanzee could be produced in a laboratory. After all, human and chimp or bonobo share, by most estimates, roughly 99 percent of their nuclear DNA.
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While most people saw the latest Batman installment-cum-Heath Ledger-homage last weekend, some other sad, deluded fools inexplicably shelled out 7. Space Chimps , to be exact. If you haven't seen the trailer, spare yourself the time and heartache with this handy synopsis: Animated chimps eat bananas and bonk their heads. The film marks a low point in an otherwise impressive track record for our furry forbearers. Besides being the progenitors of human civilization unless you're a born again Christian, in which case they're just big hairy coincidences , primates of every ilk have used their advanced intellectual development and shifty dispositions to carve out an impressive niche in civilized history.
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Humans are often claimed to have the largest penises among primates. This is true for penile girth, but not for length given that chimpanzee and bonobo erect penis length is comparable to that of humans erect length 14 - 17 cm. Unlike humans, chimpanzee and bonobo penises are filiform tapered into a narrow tip with no visible glans penis. Bonobos also have two small lobes at the tip of their filiform penis.
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