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 ...

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 ...

How fast can evolution take place? In just a few years, according to a new study on guppies. Researchers found that guppies introduced to a low-predation environment adapted to their new environment ...