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 ...

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 ...

In the second simulation, you've again stocked your pool with about one hundred guppies, but this time you start the test with an even mix of all four guppy types (brightest, bright, drab, and ...