Ashy-headed Goose
Chloephaga poliocephala
A handsome, distinctive goose of wetlands, lakes, and slow-moving rivers especially in wooded and forested areas. Usually in pairs or small groups, often associating with groups of Upland Geese. Unlike the slightly larger Upland Goose, sexes of Ashy-headed look alike. At a distance, the bright rusty breast is usually more noticeable than the ashy-gray head. Like other austral geese, shows bold black-and-white wing pattern in flight.
识别特征
The ashy-headed goose is 50 to 60 cm (20 to 24 in) long. Males weigh 1.62 to 2.27 kg (3.6 to 5.0 lb) and females 1.47 to 1.49 kg (3.2 to 3.3 lb). Adults have the same plumage. Their heads and necks are gray, their upper back and breast chestnut with fine barring, their flanks barred black and white, and their belly white. In flight their blackish wings show bold white leading and trailing patches and a metallic green speculum. Their bill is black and the legs and feet orange with black markings. Juveniles' rufous areas are much duller, their back and breast barring stronger, and their speculum dark brownish.
分类信息
The ashy-headed goose is monotypic.
- 学名
- Chloephaga poliocephala
- 命名信息
- Sclater, PL, 1857
- 目
- Anseriformes
- 科
- Anatidae
- 属
- Chloephaga
分布与栖息地
The ashy-headed goose is a bird of South America's southern cone from central Chile and Buenos Aires Province, Argentina, south into Tierra del Fuego. It also occurs as vagrant on the Falkland Islands and has bred there. In summer it primarily inhabits clearings in damp forests of southern beech (Nothofagus sp.) around lakes and marshes, on inland islands, near the coast, and on higher ground. In winter it favors meadows and pastures.
- 迁徙
- Complete migrants
行为
The ashy-headed goose nests south of 37° south latitude in Chile and western Argentina. In winter much of the population moves further north in Chile and onto the Argentinian Pampas.<p>The ashy-headed goose is almost entirely vegetarian. A study of its diet on its wintering grounds in Argentina showed it feeding mainly in harvested fields of wheat, maize, sunflower, and sorghum. One in the austral summer in Tierra del Fuego showed a diet there of leaves and fleshy fruits. Red crowberry (Empetrum rubrum) was the dominant fruit.<p>The ashy-headed goose's breeding season begins in October to November and in some areas lasts to March. It nests singly or in small loose groups. Nests are placed in a tree hollow, on a stump, or in long grass, and are lined with down. The clutch size is four to six eggs. Males guard females during the incubation period of about 30 days. The time to fledging is not known.<p>Male and female ashy-headed geese have different vocalizations: Males make "soft, wigeon-like whistles" and females "harsh cackling notes".
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Lesser Racket-tailed Drongo
Dicrurus remifer
An ebony shadow trailing obsidian tresses. Medium-sized drongo with two extravagantly long tail feathers tipped with plumes, the shape of which vary throughout its range. Glossy black overall with red eyes. Juvenile duller and lacks streamers. Can be confused with the larger Greater Racket-tailed Drongo, but Lesser is crestless and oddly flat-headed, with a more square-ended tail. Inhabits mid- to high-altitude tropical forests, where it forages primarily under closed canopies, not venturing out into the open as frequently as Greater Racket-tailed. Joins mixed flocks. Impressive vocal range, giving highly variable songs that include bouncy hoots, ringing whistles, and harsh nasal notes, among others; also mimics other species.
Rufous-sided Honeyeater
Ptiloprora erythropleura
A medium-sized honeyeater of montane forest in western New Guinea. Dark gray-brown back and wings with pale rufous edges to the flight feathers, gray face and chest with deep rufous flanks. Faint streaking overall, strongest on the head. Similar to Gray-streaked but Rufous-sided is smaller with less distinct streaking and red rather than gray eyes. Call, a mournful, whistled up-and-down “wiiiiuuuu” or down-up-down “piiuuweew”.
Guianan Red-Cotinga
Phoenicircus carnifex
Handsome but seldom-seen cotinga of lowland rainforest. Males are brilliant red and dark rich brown; females are duller but identifiable by red and brown plumage and manakin-like shape. Occurs in mid-story and canopy, where they are usually seen alone. Feeds on fruit which it takes in short sallies from a nearby perch. In limited area of overlap with Black-necked Red-Cotinga, note Guianan’s browner plumage and less clean-cut appearance. Generally quiet; male display sounds include a high-pitched wing whirring and short, explosive calls, both of which may be heard away from display sites.
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