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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 ...
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 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.
A wide range of common names apply to this combined species, including green-and-black streamertail, Jamaican streamertail or simply streamertail. The name streamertail is a reference to the greatly elongated rectrices of the males.
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 black-bellied thorntail weighs about 3.2 g (0.11 oz). Males are 12 to 13.7 cm (4.7 to 5.4 in) long and females 7.4 to 7.6 cm (2.9 to 3.0 in). Adults of both sexes of the nominate subspecies have an iridescent emerald green crown and coppery green upperparts with a white band across the rump.
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The black-bellied hummingbird is 7 to 8 cm (2.8 to 3.1 in) long and weighs about 3.0 to 3.5 g (0.11 to 0.12 oz). Males have a black breast and belly that provide the species' English name; their forehead and face are also black. The sides of the breast are green and the undertail coverts white. They have mostly bronze green upperparts with ...