Violet-crowned Hummingbird

The violet-crowned hummingbird is 10 to 11.5 cm (3.9 to 4.5 in) long and weighs 5.1 to 5.8 g (0.18 to 0.20 oz). Both sexes of both subspecies have a bright red bill, sometimes with a black tip. Adult males of the nominate subspecies have an intense violet-blue crown, a bluish violet hindneck, and dull grayish brown to greenish brown back and rump. Their tail is coppery bronze. Their underside from throat to undertail coverts is pure white with light olive green flanks. Adult females are virtually identical, though in general somewhat duller overall. Males of subspecies R. v. Voice: One description of the violet-crowned hummingbird's song is "a series of very high, thin, descending notes seew seew seew seew seew". It is sung from an exposed perch. One of its calls is described as "a rather dry tak or chap or as a hard chip, stik or tik", and it makes a wide variety of other calls when interacting with other hummingbirds.