By Josh Gabbatiss. Best mates? Female bottlenose dolphins can control the paternity of their offspring. Some female dolphins have evolved a secret weapon in their sexual arms race with males: vaginas that protect them from fertilisation by unwelcome partners.
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It is important for social animals to be able to recognise one another quickly. Humans are able to recognise each other immediately from their faces. To date little is known about how humans and chimpanzees process information about faces and buttocks. The key question that Kret explored was whether chimpanzees process rear ends just as efficiently as we process faces. This does appear to be the case. Like the face in humans, chimpanzees derive important information about identity, attractiveness and health from the buttocks. When females are in their monthly fertile period, the parts around the anus and vagina dilate and become dark pink in colour. For chimpanzees, the buttocks are therefore very important in recognising one another at a single glance.
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