sexual selection
For Mice, Bigger Balls Aren't Always Better
Yes, those balls. You know the ones I'm talking about. The man rocks, the family jewels, the subject of that ACDC song we've all tried to forget about. In the great mammalian sex race, a male with big balls is likely a very successful reproducer, being both dominant and popular with the ladies. New research has found that with mice, however, that this isn't always the case. The best balls, experts are now claiming, don't always take up a lot of space.
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