Habitat: The tropical fresh waters of northern South America and the southern Caribbean. The excitement of the new. The attraction of the exotic. Sometimes it’s nice to have a change. This is a ...

When choosing more attractive guys, girl guppies with larger brains have an advantage over their smaller-brained counterparts. But there’s a cost to such brainpower, and that might help explain one of ...

Sexual harassment is a burden that females of many species face, and some may go to extreme lengths to avoid it. Female guppies, a popular aquarium fish, may even risk their lives to avoid too much ...

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Guppies might look like mindless, mouth-breathing little bastards, but it turns out some of them make better dating decisions than we do. No, really—these tiny fish, with their infinitesimal brains, ...