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This is Scientific American 60 Second Science.

I'm Ashley Papp.

Monogamy and animals, and let's be honest, and humans too, is a funny thing.

Only a few animal species have been lumped into the one partner for life category, and even then,

there are exceptions to those rules.

Prairie voles are furry little rodents that live throughout North America.

They're a particularly interesting species because they form lifelong partnerships.

Annalise Beery, a behavioral neuroscientist with Smith College in Massachusetts

and the University of California at Berkeley, studies vol monogamy in the wild and in the lab.

So I would define monogamy as a formation of a lasting partnership or a social relationship between

mates. Social relationships are very important for human biology,

and Prairievilles are one of the only species that are studied in the lab that exhibit this trait.

Monogamy is fairly rare in rodents, and it's also unusual for rodents to form lasting social

relationships of any kind. We already know about some things that support monogamy in the wild, like when mates are

scarce and it makes sense to hold on to the one you're with, or when both sexes stick around

to raise their young. But so far, there isn't one clear explanation as to why or how animals

...