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These female hummingbirds evolved to look like males—apparently to evade aggression


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White-necked jacobin hummingbirds sport a colorful blue-and-white plumage as juveniles. When they grow into adulthood, males retain this dazzling pattern, while females develop a more "muted" palette of green and white—at least, most females. Curiously, about 20% of females defy the norm and retain male-like plumage into adulthood.

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