Male-like ornamentation in female hummingbirds results from social harassment rather than sexual selection
Female white-necked jacobin hummingbirds are polymorphic—some express ornamented plumage like adult males. Falk et al. find that all juvenile females have male-like plumage, which some maintain as adults. Rather than being favored by sexual selection, male-like plumage benefits females by reducing social harassment from this and other species.
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