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This is Scientific Americans' 60-second science.

I'm Karen Hopkins. Some parents get overly involved in their kids' personal lives, but Bonabot mothers take this tendency to the extreme. They fix up their

adult sons with a female of their choosing, and they even keep other males from getting near their

future daughter-in-law.

The behavior may seem overbearing, but it boosts the odds that they'll be surrounded by grandkids.

That's according to a study in the journal Current Biology.

Researchers studying wild bonobos in the Congo notice that some females behaved a bit like males,

fighting over fertile females and fending off some of the males who come a courtin. That observation struck primatologist Martin

Surbeck as odd. So I just wondered, hey, what is it actually of their business? No, it seemed

most of the mammals, it's just a male business, this competition over the

access to females.

To get to the bottom of this unusual activity, Sorbek, who is currently at the Max Planck Institute

for Evolutionary Anthropology, got DNA samples from the players in this melodrama.

And so it became more apparent when we did the paternity analysis and it turned out

these females were mothers of some males. And in this female dominated society of Bonobos,

the mothers act kind of like a social passport, allowing their sons to be more central in the group

...