In the animal kingdom, it’s no secret that the most masculine male usually gets the girl; big bodies, large antlers, and low frequency calls tend to drive the ladies wild. But once the guy gets the girl and the girl gets pregnant, high levels of testosterone aren’t necessarily a good thing. According to new research in PNAS, males with high testosterone are more likely to become fathers, but once they have children, their testosterone levels fall dramatically.
In animals like birds where paternal care is common, males tend to downregulate their testosterone production once babies are born. Humans, however, are one of the few mammalian species in which males help raise the offspring. Since this is a rare trait among mammals, we don’t know much about our reproductive strategies when it comes to testosterone.
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