This is known as the inversion effect. And a new study finds that we’re not the only species to demonstrate it: Chimps do, too. Only they do it with butts. And this says something about human evolution — but we’ll get to that in a bit.
Humans are really good at picking out faces. Our brains are so good at this that we even see faces in places they don’t exist — like Jesus on toast. Flip a face upside down, though, and the brain needs an extra moment to determine that, yes, that’s a face.





heatherlynneburrows/Flickr (CC-BY-NC 2.0)
In 2008, Frans de Waal and Jennifer Pokorny of Emory University in Atlanta showed in an Ig Nobel–winning experiment that chimpanzees could recognize each other from their behinds — or at least photographs of them. The chimp rear, it turns out, conveys important information about sex and, in females, ovulation status. Both males and females pay attention to those signals, which are important in mating and competition.


What is this chimp looking at? Chimpanzees look at each other’s rears in the same way that humans look at each other’s faces, a new study finds.



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