Why do we cheat on our partners?
The Why Factor
The Benefits of Being Monogamous
Natural selection seems to actively be keeping both of these brain types around. There doesn't seem to be a single kind of a normal brain for prairie vols. And evolution seems to be pretty ok with that. Promiscuous voles may be forgetful, but they still mate a lot so they do good work continuing species. But what's the evolutionary benefit of monogamy? So having a male around can help defend them. Having a male around Can also keep them warm while the female is out foraging.
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