Thursday, June 10th, 2010...5:48 pm
Supernormal Stimuli and Chickadee Caps
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The healthiest, largest male chickadees have the highest crests on their heads and they are sought after as mates. When researchers outfit runt males with little pointed caps, much like the human dunce cap, females line up to mate with them, forsaking the naturally fitter, hatless males.
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