Golden-crowned Emerald
Cynanthus auriceps
Very small, fork-tailed hummingbird endemic to western Mexico. Favors scrubby woodland, forest edge, and flower banks; mainly in drier habitats. Feeds at all levels, wagging its tail as it feeds. Males sometimes perch on exposed high twigs. Male is distinctive; wholly emerald green (crown is not really golden, more of a golden-green) with very long, deeply forked blackish tail, and reddish bill with a black tip. Female has a striped face and reddish bill with a black tip. Female resembles female Broad-billed Hummingbird, but much smaller with a shorter and straighter bill.
识别特征
The golden-crowned emerald is 7.5 to 9.5 cm (3.0 to 3.7 in) long and weighs about 2.2 g (0.078 oz). The adult male's crown is brilliant golden green and the rest of its upperparts duller golden green to bronzy green. Its underparts transition from an almost pure green on the chin and throat to brilliant golden green at the vent. The tail is long and deeply forked; its feathers are black with a violet-bluish gloss, and the central three pairs have broad brownish gray tips. The adult female's upperparts are like the male's. Its underparts are light gray that is palest on the belly and vent. Its cheeks are dusky with a grayish white streak behind the eye. Its tail is also forked but much shorter than the male's; the central feathers are bluish green to bronze green and most have a black band near the end and gray tips. The male's bill is red with a black tip, the female's mandible is red with a black tip and the maxilla is black.
分类信息
The golden-crowned emerald was originally described in genus Trochilus. Since then it has variously been classified as a subspecies of what is now Canivet's emerald (Cynanthus canivetii) and included in blue-tailed emerald (Chlorostilbon mellisugus). In 2020 the North American Classification Committee of the American Ornithological Society (AOS), the International Ornithological Committee (IOC), and the Clements taxonomy placed it in genus Cynanthus with Carnivet's emerald, broad-billed hummingbird (C. latirostris), Turquoise-crowned hummingbird (C. doubledayi), and the Cozumel emerald (C. forficatus). The 2020 Version 5 of BirdLife International's Handbook of the Birds of the World retains it in Chlorostilbon.<p>The golden-crowned emerald is monotypic.
- 学名
- Cynanthus auriceps
- 命名信息
- (Gould, 1852)
- 目
- Apodiformes
- 科
- Trochilidae
- 属
- Cynanthus
分布与栖息地
The golden-crowned emerald is found in western Mexico from Sinaloa south to eastern Oaxaca and also inland up the Balsas River basin to southern Morelos. It inhabits tropical dry forest at elevations from sea level to 1,800 m (5,900 ft).
- 迁徙
- Resident species
行为
The golden-crowned emerald is mostly resident but is thought to make some seasonal elevational movements in a few areas.<p>The golden-crowned emerald is a "trap-line" feeder, visiting a circuit of flowering plants to take nectar. They wag their tail and spread its fork as they feed. In addition to nectar, they take insects from foliage.<p>The golden-crowned emerald's breeding season appears to span from February to July. It builds a small cup nest near the tip of a thin branch near the ground. Four nests in Jalisco had a small platform of wood pieces under the cup. The cup was made of kapok seed fibers with grass, bits of wood, and lichens on the outside. The clutch size is two eggs and fledging occurs about 24 or 25 days after hatch.<p>The golden-crowned emerald has "dry, rattling and chattering calls".
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
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