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Xantus's hummingbird is 8.5 to 9.5 cm (3.3 to 3.7 in) long. Males weigh an average of 3.5 g (0.12 oz) and females 3.4 g (0.12 oz). Their bills are straight and about 1.7 cm (0.67 in) long; males' are red with a black tip. Females' maxilla is black with a pinkish base and their mandible pinkish red with a black tip.
The streamertails are hummingbirds in the genus Trochilus, that are endemic to Jamaica. It is the type genus of the family Trochilidae. Today most authorities consider the two taxa in this genus as separate species, but some (e.g. AOU) continue to treat them as conspecific, in which case scitulus is a subspecies of T. polytmus.
The female is about 10.5 cm (4.1 in) long and weighs 3.0 to 6.1 g (0.11 to 0.22 oz). The adult male has a coral red bill with a black tip. It has a dull black to blue-black crown; it and the nape form a deep velvety black crest. The rest of its upperparts are bright metallic green. Its tail is black with a green to bronzy green gloss.
The female is about 10.5 cm (4.1 in) long and weighs 3.5 to 5.5 g (0.12 to 0.19 oz). Both sexes have a black bill. The male has a dull black to blue-black crown; it and the nape form a deep velvety black crest. The rest of its upperparts are bright grass green. Its tail is black with a green to bronzy green gloss.
The most common species, the white-bearded helmetcrest, measures 11.4 cm (4.5 in) in length, it is a small hummingbird with a very small 8 mm (0.31 in) bill. The adult male has a distinctive pointed black crest and a shaggy white beard. The face and cheeks are blackish, rendering a triangular shape with the white fronted crest and white beard.
White-tailed hummingbird: Eupherusa poliocerca Elliot, DG, 1871: 308 Oaxaca hummingbird: Eupherusa cyanophrys Rowley, JS & Orr, 1964: 309 Stripe-tailed hummingbird: Eupherusa eximia (Delattre, 1843) 310 Black-bellied hummingbird: Eupherusa nigriventris Lawrence, 1868: 311 Scaly-breasted hummingbird: Phaeochroa cuvierii (Delattre & Bourcier ...
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Many other species of hummingbirds also produce sounds with their wings or tails while flying, hovering, or diving, including the wings of the calliope hummingbird, [165] broad-tailed hummingbird, rufous hummingbird, Allen's hummingbird, and the streamertail species, as well as the tail of the Costa's hummingbird and the black-chinned ...