There appears to be an underlying selection mechanism at work among Gouldian finches -- a mechanism that allows this species to produce and maintain individuals with red heads, black heads, and yellow heads.
from All Top News -- ScienceDaily https://www.sciencedaily.com/releases/2019/04/190423133520.htm
from All Top News -- ScienceDaily https://www.sciencedaily.com/releases/2019/04/190423133520.htm
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