Black-backed Grosbeak
Pheucticus aureoventris
Uncommon in the Andes from western Venezuela to Argentina. Male is black above with a yellow belly and prominent white patches on the wings. Most populations have an entirely black head and chest, but birds in southern Colombia and Ecuador have yellow up the throat. Females are similar to males, but are duller brownish instead of black with more yellowish mottling above. Both sexes have huge bill. Occurs in scrubby woodlands, forest edge, and gardens from around 500 to 3,200 m. Often found in pairs that perch conspicuously.
识别特征
The black-backed grosbeak is approximately 22 cm (8.7 in) long and weighs 43.8 to 66.2 grams (1.54 to 2.34 oz). All of the subspecies except P. a. crissalis are very similar. The males' upperparts are black with a yellow shoulder patch; the closed wings show white patches. The chin, throat, and upper breast are also black. The lower breast and belly are bright yellow with a variable amount of black flecking on the sides and flanks. The female is similar but browner and has yellow mottling on the upperside and dusky speckles on the underside. P. a. crissalis differs mainly in having a yellow chin, throat, and upper breast where the other subspecies are black.
分类信息
The black-backed grosbeak has five recognized subspecies:<p>There is some evidence that the black-backed grosbeak may be paraphyletic with respect to golden grosbeak (Pheucticus chrysogaster). Their ranges overlap in Peru.
- 学名
- Pheucticus aureoventris
- 命名信息
- (d'Orbigny & Lafresnaye, 1837)
- 目
- Passeriformes
- 科
- Cardinalidae
- 属
- Pheucticus
分布与栖息地
The black-backed grosbeak is a bird of the eastern Andes. The subspecies are found thus. All except the nominate are believed to be sedentary.<p>The black-backed grosbeak inhabits dry to very dry woodland (scrubby to open) and is often found in gardens. In Venezuela it generally ranges in elevation from 1,450 to 2,000 m (4,760 to 6,560 ft) and occasionally up to 3,700 m (12,100 ft). In Colombia it is found between 1,700 and 3,000 m (5,600 and 9,800 ft) and in Peru mostly from 1,200 to 3,200 m (3,900 to 10,500 ft). At the southern end of its range in can be found as low as 600 m (2,000 ft).
- 迁徙
- Complete migrants
行为
The black-backed grosbeak's diet is berries, seeds, flowers, and insects. It usually forages singly or in pairs, but several may gather in a fruiting tree. It mostly forages high up in trees but can be seen at any level. It does not join mixed-species foraging flocks.<p>Little information about the black-backed grosbeak's breeding phenology has been published. Evidence or proof of breeding such as adults with enlarged gonads, nests with eggs, and a fledged chick have been noted between November and January. Nests are an open cup made of vine stalks and lined with fine fibers placed up to 3 m (9.8 ft) high in a shrub. The plush-crested jay (Cyanocorax chrysops) is a frequent predator at the nest.<p>The black-backed grosbeak's song is "a rich, melodious series of whistled notes" [1]. Its call is "a sharp 'keck'" [2].
保护状况
- 种群趋势
- unknown
照片
分布
鸟叫声
其他鸟类
Violet Woodhoopoe
Phoeniculus damarensis
An elongated black bird with a coppery-purple metallic sheen and a long, decurved red-orange bill. The juvenile has a dark bill, but is often in the company of adults. The species flies heavily with the white-tipped tail dangling. Pairs and groups of 3-12 are highly social, occupying arid savanna, woodland, and riverine forest along the Namib escarpment, where they nest and roost in natural cavities. They clamber in trees, probing bark and crevices for insects and small vertebrates, and communicate using a strong cackling chatter that is almost maniacal. The almost identical Green Woodhoopoe (with which this species sometimes hybridizes) only differs from Violet Woodhoopoe by having a glossy-greenish (not coppery-purple) metallic sheen.
Black-tailed Trainbearer
Lesbia victoriae
Small hummingbird with an exceptionally long tail. Green overall with a fairly short, slightly decurved bill. The male’s long tail is striking. Sexes similar but females are more spotted below and have a shorter tail. Could be confused with Long-tailed Sylph, but the trainbearer occurs in dry, scrubby, open habitats, not in forests. Compare with very similar Green-tailed Trainbearer; Black-tailed has a longer, more decurved bill, a longer tail that usually looks slightly curved, and is somewhat duller green. Occurs from Colombia to Peru, from around 2,500 to 3,800 m. Occasionally visits feeders, but more often seen feeding at flowering shrubs.
Mallard
Anas platyrhynchos
A large duck, generally common and familiar within its extensive range. Males are distinctive with iridescent green head, yellow bill, chestnut breast, and gray body. Females are mottled brown with orange and black splotches on the bill. Found anywhere with water, including city parks, backyard creeks, and various wetland habitats. Often in flocks, and frequently mixes with other duck species. In North America, females can be tricky to distinguish from American Black Duck, Mottled Duck, and Mexican Duck where ranges overlap. Those species are all darker-bodied than Mallard. A good view of the wing can be helpful, too: white wingbars on the leading and trailing edges of the blue wing patch are bolder on Mallard. Frequently hybridizes with those species, which can be even more confusing. Any bird with extensive white in the tail or curled feathers above the tail has some Mallard genes.
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