Summary: Guppies in the wild have evolved over at least half-a-million years — long enough for the males' coloration to change dramatically. Yet a characteristic orange patch on male guppies has remained remarkably stable, though it could have become redder or more yellow. Why has it stayed the same hue of orange over such a long period of time?
Impact: This might tone down perky creationist. (Hopefully)
Critic: I hope they find more things to back evolution someday
Reference: http://www.biologynews.net/archives/2011/11/25/they_call_it_guppy_love_ucla_biologists_solve_an_evolution_mystery.html
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