Concept
Version 12
Created by Boundless
Nonrandom Mating and Environmental Variance
Assortative mating in the American Robin
The American Robin may practice assortative mating on plumage color, a melanin based trait, and mate with other robins who have the most similar shade of color. However, there may also be some sexual selection for more vibrant plumage which indicates health and reproductive performance.
Source
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"American Robin Close-Up."
http://en.wikipedia.org/wiki/American_Robin%23mediaviewer/File:American_Robin_Close-Up.JPG
Wikimedia
CC BY-SA 3.0.