Tiny frugivores of Neotropical forests, these large-headed, short-tailed birds are strikingly dimorphic: females are uniformly plain olive-green, whereas males of most species are black or white with vibrant patches of red, yellow, or blue. This dimorphism evinces highly derived mating displays, with most species displaying in small leks, showing off their sights and sounds alone or in cooperative duets. Many species also emit different non-vocal sounds in display, most produced by clapping their wing feathers together.

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