TALLAHASSEE, Fla.--In the natural stream communities of Trinidad, guppy populations live close together, but evolve differently. Upstream, fewer predators mean more guppies but less food for each; ...

How people respond to stressful situations can say a lot about their personalities—and it turns out the same is true of a little fish called the Trinidadian guppy. That's according to a study ...

At least three pigment cell types from multiple layers of skin contribute to the color patterns of male guppies. At least three pigment cell types from multiple layers of skin contribute to the color ...

Guppies faced a see-through food trap, and their reactions ranged from patient detours to head-long collisions, exposing big individual gaps in self-control. Compared with a cousin population, these ...