Red-necked Stint
Calidris ruficollis
A very small shorebird of both inland and coastal wetlands and estuaries. Breeding adult has vivid orange head bordered by dark stippling (no dark markings internal to the orange, unlike Little Stint) and bright orange and gold tones in upperwing coverts. Nonbreeding adult gray above, pale below; juvenile similar but richer gray-brown above with neat pale feather edges in upperparts. Flight call a high-pitched, raspy “krreeet.”
识别特征
These birds are among the smallest of waders, very similar to the little stint, Calidris minuta, with which they were once considered conspecific. The red-necked stint's small size, fine dark bill, dark legs and quicker movements distinguish this species from all waders except the other dark-legged stints. It measures 13–17 cm (5.1–6.7 in) in length, 28–37 cm (11–15 in) in wingspan and 21–51 g (0.74–1.80 oz) in body mass. It can be distinguished from the western sandpiper and the semipalmated sandpiper in all plumages by its combination of a fine bill tip, unwebbed toes, and longer primary projection.<p>The breeding adult has an unstreaked orange breast, bordered with dark markings below, and a white V on its back. In winter plumage identification is difficult, although it is shorter legged and longer winged than the little stint. Juveniles have more contrasting mantle plumage and weaker white lines down the back than their relative. The call is a hoarse "stit".
分类信息
- 学名
- Calidris ruficollis
- 命名信息
- (Pallas, 1776)
- 目
- Charadriiformes
- 科
- Scolopacidae
- 属
- Calidris
分布与栖息地
Red-necked stints are strongly migratory, breeding along the Arctic littoral of eastern Eurasia and spending the non-breeding season in South East Asia and Australasia as far south as Tasmania and New Zealand. They are rare vagrants to western Europe, with most records from Ireland. They are often seen in western Alaska and occasionally elsewhere in the Americas.
- 繁殖区
- PAL : coastal low Arctic to subarctic tundra of nc, ne Siberia: Taymyr Pen. (nc Siberia) e to Chukotskiy Pen. and s to n Kamchatka Pen. (ne Russia)
- 非繁殖区
- OR, AU : coastal ne India and Sri Lanka through se Asia, Indonesian Arch., New Guinea, Australia, Melanesia from Bismarck Arch. to New Caledonia, New Zealand, Philippines to Ryukyu Is. (=Nansei Shoto, s Japan)
- 迁徙
- Complete migrants
行为
Red-necked stints are highly gregarious and will form flocks with other small Calidris waders, such as sharp-tailed sandpipers and curlew sandpipers in their non-breeding areas.<p>Their breeding habitat is tundra. They nest on the ground and breed from spring to summer.<p>They forage in wet grassland and soft mud, mainly picking up food by sight. In their non-breeding habitat they feed on intertidal mudflats and along the muddy margins of freshwater lakes. They mainly eat insects and other small invertebrates.
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Stejneger's Scoter
Melanitta stejnegeri
Large scoter with distinctive white patch on wing. Males are black and have small white mark under eye, dark knob on the bill, and red-and-orange bill tip. Females are dark chocolate-brown and have two rounded white patches on face. Extremely similar to White-winged Scoter: note male’s much more angular head structure with steeper and more prominent protuberance and different bill coloration. Female is much more difficult to identify, but has more swollen-looking protuberance. Breeds in Russian tundra and taiga pools and lakes, winters on the coast; only very occasionally reported inland in the winter.
Angola Waxbill
Coccopygia bocagei
A tiny colorful seed-eating waxbill with a grayish breast, a yellow belly, an olive-green back finely barred with dark gray, and a scarlet rump and upper tail. The male has a black throat patch that the female lacks. A local West Angolan endemic. Pairs and small groups eat grass in open areas adjacent to forest and thickets. Vocalizations are undescribed, but the species probably gives calls similar to the plaintive “swee-swee” and “seeet” of the closely related Swee and Yellow-bellied Waxbills. No similar waxbills overlap in range.
Williamson's Sapsucker
Sphyrapicus thyroideus
A boldly patterned woodpecker of mountain forests with mix of conifers and aspen. Male is striking: mostly black with bold white wing patch, two white stripes on face, red throat, and yellow belly. White rump is conspicuous, especially in flight. Female has a brown head and intricate black-and-white barring on the body and wings; the yellow belly can be hard to see. Typically occurs singly or in pairs, often foraging inconspicuously. Moves to lower elevations in migration and winter, occurring in a variety of wooded habitats, often with oaks and conifers. Staccato drumming like other sapsuckers, starting out fast and slowing down with uneven tempo. Also listen for various other rasping calls.
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