A Male Chimp Can Spot an Ovulating Female From More Than a Quarter Mile Away

Chimpanzee

An ovulating female chimp, that is. Nearly all female primates advertise their days of fertility with colorful genital swellings.

It seems like a useful indicator for humans trying to have babies or trying not to have babies, but for some reason evolution has seen fit to conceal the reproductive state of human females from observation.

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