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Azure-crowned Hummingbird is a common species throughout many forested habitats from Mexico south to Nicaragua. Even though this hummingbird occupies a wide variety of habitats, in both pine and broadleaf forests from sea level up into the mountains, specific factors limiting the range of the species have not been satisfactorily identified. Sexes appear similar, though immatures have duller crowns; generally this species is blue crowned with a greenish iridescent hindneck, white throat, brownish back and wings, and a thin, red bill with a dark tip. Azure-crowned Hummingbird usually announces its presence with a series of sharp "chup" notes.