House Finch Color Spectrum

 

This illustration shows the variation of male coloration in house finches (Haemorhous mexicanus). Like many species of birds (Aves), male house finches have flashier plumage than the females, and this is often a signal of the physical fitness of the individual, allowing females to select a quality mate. The brighter the red heads of the males, the more nutritious their diets, and the more attractive they are to females. 

A 2016 National Science Foundation “Vizzies” illustration finalist.

Graphite on paper, colored in Adobe Photoshop