SAN FRANCISCO — Lions and tigers and bears and… guppies? Don't let its tiny size, delicate tail or fondness for aquarium life fool you; a new chemical analysis places the guppy high up on the food ...

Predators play an important role in the evolution of guppy populations. Take a closer look at some of the fish that have the greatest impact on guppies.

From our perspective, guppies lead simple lives—eating, reproducing, and, after a couple of years, dying. Apply a little evolutionary pressure, though, and they can evolve larger brains that make them ...

Ugly friends can make you look better, at least if you're a guppy, researchers say. Scientists investigated guppies (Poecilia reticulata), a common aquarium pet, and one of the few fish species to ...

The male guppies that were depicted in this sexual selection model only begin to demonstrate the vast range of colors and patterns expressed by wild guppies. Below are some examples of wild guppies, ...