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 ...

This image shows a female and two male guppies (Poecilia reticulata) from the Arima River, Trinidad. Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted ...

MORE: High levels of bacteria in water lead to multiple beach closures across the US During that time, researchers studied and noted the activity and risk-taking behavior of the male guppies ...

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 ...

and iridophores—contribute to male guppies’ colors. Using electron microscopy, the researchers found that pigment layers in both the dermis and hypodermis played a role in generating the fishes’ spots ...

Presence of additional males causes male guppies to court females more actively. A male guppy who courts only the larger of two available female guppies may increase his reproductive success over a ...

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 ...