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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 ...
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 ...
The black jacobin is 12 to 13 cm (4.7 to 5.1 in) long. Males weigh about 9 g (0.32 oz) and females 8 g (0.28 oz). Adults of both sexes are mostly black, with a bronzy-olive lower back and uppertail- and wing-coverts. The flanks are white, the inner rectrices black, and the outer rectrices white with black tips. Juveniles are dark except for a ...
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 rest of its upperparts are bright grass green. Its tail is black with a green to bronzy green gloss. The next to outermost pair of tail feathers is very long, giving the species its English name. The male's face and most of its underparts are metallic green; the undertail coverts are blue-black or black with a bluish gloss. The adult female ...
The black-breasted puffleg's response to microhabitats variations is extremely sensitive. It has been suggested that the species is under competitive disadvantage for the same ecological niche with others hummingbird species, specifically the Gorgeted sunangel , and that avoidance of forest borders is used to mitigate the stress imposed by the ...
Males weigh 7.4 to 9 g (0.26 to 0.32 oz) and females 6 to 9.2 g (0.21 to 0.32 oz). The male is unmistakable with its dark blue head and chest and white belly and tail; the tail feathers have black tips. A white band on the nape separates the blue head from the bright green back and long uppertail coverts. Females are highly variable, and may ...