The Elements of Evolution (46-4) Guppies

 Guppies

Some guppies have a fondness for orange foods. The preference varies by population.

In those with a sunny disposition, males acquire orange pigments from the carotenoids in their food. They incorporate the orange coloring into tail tattoo patches.

Females fall for a male with big orange tattoos. This signal is meaningful, as it indicates a male as a successful forager.