And if bright colors made guppies more conspicuous to predators, why should males be colorful at all? To find out, Endler formed a hypothesis based on his observations, then set out to test it.

In this guide, I’ll introduce the five most popular livebearer species in the aquarium hobby and help you decide which type is ... to see what all the fuss is about. Male guppies have amazing ...

The brightest males and drabbest males are still faring pretty well under the extreme predation pressure, but all ... guppies' days are numbered. This trend is similar to the one Endler observed ...