In a simulation or in the wild, where predators are plentiful, male guppies become increasingly drab over generations, pushed by predation pressure toward greater camouflage. So if camouflage ...

Male guppies have amazing color patterns, and many breeds have really fancy fins, too. Female guppies might not be as boldly marked as the boys, but they are still great-looking fish. However ...

These are two male Trinidadian guppies, showing the range of color patterns observed in the population. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases ...

A properly dressed male guppy, with its gaudy blue spots and ... When evolutionary biologist John Endler began studying Trinidad's wild guppies in the 1970s, he was struck by the wide variation ...