Sniffing the armpit of a sweaty T-shirt seems like it would give you more information about a person’s laundry habits than their potential qualities as a mate. But an array of complex signaling chemicals in sweat and other secretions allows humans and other primates to determine just who would make the best partner.
One gleaming orange eye opened, then the other. These eyes, set in tufts of black fur against a gray face, belonged to a male ring-tailed lemur (Lemur catta) and tracked the path of graduate student Jeremy Chase Crawford as he walked by. That day, at the Duke Lemur Center in Durham, North Carolina, Crawford carried with him a set of three wooden dowels.
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The primate began jumping when he saw the dowels, and as Crawford came closer, he began ...
