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 ...

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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 ...

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Lions — Male lions often kill and sometimes eat cubs that aren’t their own to bring females back into heat. Hamsters — Mothers may eat their young if they feel stressed, threatened, or if the babies ...

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 ...