White-headed Woodpecker
Dryobates albolarvatus
Distinctive woodpecker, unlikely to be confused with any other species. Almost entirely black with white head and small white wing patch. Males have red patch on back of crown; sexes otherwise alike. No other woodpecker shows clean white head and lack of patterning on back or belly. Found in coniferous forests, often in mountains. Usually seen in pairs or family groups. Listen for sharp "peek" notes, often rapidly doubled or tripled.
识别特征
It has a black body (approximately 20 cm (7.9 in) long) and white head. It has white primary feathers that form a crescent in flight. Males have a red spot at the back of the head.
分类信息
Most of the range is occupied by the nominate subspecies. In the southern part of the range, L. a. gravirostris, which has a longer bill - especially in males - and tail, is only found on mountaintops of the San Gabriel Mountains to San Diego County. Birds on Mount Pinos are somewhat intermediate. mtDNA cytochrome b and ATP synthase subunit 6 sequence data confirms this arrangement and also suggests that the Mount Pinos birds are closer to L. a. gravirostris (Alexander & Burns, 2006). Apparently, the larger bill of the southern subspecies is an adaptation for being better able to feed on the large, spiny cones of Coulter pines (Pinus coulteri). Some taxonomic authorities, including the American Ornithological Society, place this species in the genus Dryobates.
- 学名
- Dryobates albolarvatus
- 命名信息
- (Cassin, 1850)
- 目
- Piciformes
- 科
- Picidae
- 属
- Dryobates
分布与栖息地
The range of the white-headed woodpecker stretches in the mountains from British Columbia through southern California. They form nests in dead trees or snags and reproduce once per year.
- 迁徙
- Vertical migration
保护状况
- 种群趋势
- stable
照片
分布
鸟叫声
其他鸟类
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Small antbird of rainforest canopy; somewhat more common in forests with sandy soils. From below, note clean white underparts and heavy bill. Usually encountered with mixed-species flocks. Forages slowly along limbs and explores leaf clusters. Very similar to Todd’s Antwren and most safely separated from that species by voice. Song is an accelerating “bouncing ball” series, similar to Pygmy Antwren but with a harder quality and not falling in pitch at the end.
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Unique and spectacular hummingbird of the upper humid montane forest in Bolivia. Plumage mostly black, with striking white feathers on breast and a shining blue rump. Occurs to, and sometimes just above, treeline on the east side of the Andes from western Santa Cruz department to La Paz. The only black hummingbird in its range. This species is generally patchily distributed, but can be locally common, especially where flowers are abundant.
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