Bright vs. Drab

The other day we were talking about bright guppies compared to drab colored guppies. When there were a small amount of predators the bright guppies thrived because they didn't get eaten by predators and they could find mates easier than drab colored. When there were a lot of predators the number bright guppies decreased because the predators singled them out and there weren't enough left to reproduce to keep a steady number and the drab guppy numbers increased. This shows that certain traits are good for certain environments but bad for other environments.