Kevin Epperly

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November 21, 2025

Sharper, straighter, stiffer, stronger: Male green hermit hummingbirds have bills evolved for fighting

The green hermit hummingbird, which lives primarily in mountain forests of Central and South America, fights to win a mate. New research found that these fights have shaped the species’ evolution, yielding significant differences in bill shape for male and female green hermits.

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