Why unique finches keep their heads of many colors: An underlying selection...

Science
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“Most people have heard of natural selection,” says lead author Kang-Wook Kim at the University of Sheffield. “But ‘survival of the fittest’ cannot explain the color diversity we see in the Gouldian Finch. We demonstrate that there is another evolutionary process – balancing selection – that has maintained the black or red head color over thousands of generations.”