Velvet-browed Brilliant
Heliodoxa xanthogonys
Large, dark hummingbird. Common in tepui highlands. Male is mostly shining green, especially on the throat, breast, and forehead; female is white below with extensive green spotting. Both sexes have conspicuous white spot behind eye. Occurs in a wide variety of habitats including tall forest, edge, and open scrub at middle and high elevations (above 800 m) in tepui region. Feeds on nectar and defends patches of flowers from other hummingbirds. Gives loud, sharp chip note while foraging. No other large, green hummingbird occurs in its limited range.
识别特征
The velvet-browed brilliant is 10 to 11 cm (3.9 to 4.3 in) long including its approximately 2 cm (0.8 in) bill, and weighs 5.5 to 7.5 g (0.19 to 0.26 oz). Both sexes have a straight bill; the maxilla is blackish and the mandible orange with a dark tip. Both have a small white spot behind the eye.<p>Males of the nominate subspecies have a glittering golden- to emerald green central crown and a velvety blackish supercilium. The rest of the face, the hindneck, and the upperparts are dark golden green. The upper throat has a glittering violet-blue patch, the breast and belly are dark golden green, and the undertail coverts are greenish with narrow gray and rufous edges. The uppertail coverts and central tail feathers are bronze- to emerald green and the rest of the tail blackish green. Females are generally duller, with less iridescence, and do not have the black supercilium or the violet throat patch. They have a white "moustache", and most of the underparts are whitish with greenish spots. The tail feathers have white tips.<p>Males of subspecies H. x. williardi have longer wings and tail than the nominate but are otherwise similar. Females have less green and more white on their underparts, with no green spots on the belly. The tail is emerald green with broad white edges to the feathers.
分类信息
The velvet-browed brilliant has two subspecies, the nominate H. x. xanthogonys and H. x. williardi.
- 学名
- Heliodoxa xanthogonys
- 命名信息
- Salvin & Godman, 1882
- 目
- Apodiformes
- 科
- Trochilidae
- 属
- Heliodoxa
分布与栖息地
The nominate subspecies of velvet-browed brilliant is found in the highlands and tepuis where Venezuela, Guyana, and Brazil meet. In addition, there are a few records in Suriname. Subspecies H. x. williardi is found further south, on the tepuis of the southern Venezuela-northern Brazil border. The species inhabits the interior, edges, and clearings of sub-montane forest and also scrublands. In elevation is mostly occurs between 700 and 2,000 m (2,300 and 6,600 ft) but has been recorded as low as 500 m (1,600 ft).
- 迁徙
- Resident species
行为
The velvet-browed brilliant is believed to be sedentary but may make some seasonal elevational movements.<p>The velvet-browed brilliant forages for nectar both low down and high in the canopy, but in the forest interior tends to stay low. It feeds by trap-lining, visiting a circuit of flowering plants, but also defends patches of flowers. In some seasons the sexes tend to separate and feed at different resources. In addition to nectar, the species also feeds on small insects.<p>The velvet-browed brilliant's breeding season is apparently from January to March. It makes a saddle-type nest but nothing else is known about its breeding phenology.<p>The velvet-browed brilliant gives a "repeated nasal 'squank'" in flight. Another vocalization is "high-pitched drawn-out reeling trills" that rise and fall in pitch.
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
White-bellied Bustard
Eupodotis senegalensis
A small, tawny-backed bustard with a reddish base to the bill and a strongly demarcated white belly. The male has a blue-gray neck and dark facial markings. Small groups strut through open grassland and bush at elevations below 2000 m. Often first detected by a characteristic, continuous, croaking, nasal “anghara-anghara”, as well as by other similar calls. Female White-bellied Bustard strongly resembles female Black-bellied Bustard, but White-bellied has a shorter neck and legs and white rather than black foreparts to the underwing.
Abert's Towhee
Melozone aberti
Large, plain, long-tailed sparrow. Drab grayish-brown overall, with dark mask like a Northern Cardinal. Also note pinkish bill and orange undertail coverts. Inhabits riparian corridors, especially in dense brush. Mainly occurs in the Sonoran Desert of Arizona, barely extending into surrounding states and northern Mexico. Rather secretive as it forages on the ground for seeds and insects. Visits feeders.
Yellow-billed Pintail
Anas georgica
Handsome and generally common dabbling duck of wetlands, lakes, and river mouths. Sexes look alike with a bright yellow bill (duller for a short while on young birds), a plain and rather “soft-faced” brown head, and dark-mottled sides. Also note its elegant shape with a slender neck and long pointed tail. Yellow-billed Teal look somewhat similar (and often occurs in same areas) but Yellow-billed Teal are smaller and more compact with a darker head and plain grayish sides.
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