Why Do Some Female Hummingbirds Crossdress?

A lot of people are familiar with the idea that many birds are color-coded by sex: males are brilliant whilst females are drab. But hummingbirds have turned this perception onto its head because in some species, a portion of adult females have flashy male-like plumage coloring and patterns that makes them visually indistinguishable from males. Why?

Source: Why Do Some Female Hummingbirds Crossdress?

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