The hottest guy guppies stand out in a crowd

The sexiest males are a rare breed indeed

By Bethany Brookshire, 11:08 AM November 13, 2013

Female guppies love a man that sticks out. Or at least they do in the lab. When scientists study the reproduction of the popular aquarium guppy in the laboratory, they often see something called negative frequency-dependent selection, also known as the rare-male effect. That’s when the males with the rare traits, a colorful tail or wild spots, end up fathering the most offspring. But is this just a laboratory effect? And if it isn’t, what does it mean? In an article published October 30 in Na...

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