Ruddy Duck
Oxyura jamaicensis
Small, compact duck with a long, fan-shaped tail, often held sticking up out of water. Breeding males have a chestnut body, black cap, white cheek, and baby-blue bill. Winter males have a brown body, black cap and white cheek. Females and immature males are brown overall with a dark cap and dark line through the cheek. Often in tight groups bobbing like corks on ponds and bays. Dives to forage on aquatic invertebrates. Not often seen flying.
识别特征
These are small, compact ducks with stout, scoop-shaped bills, and long, stiff tails they often hold cocked upward. They have slightly peaked heads and fairly short, thick necks. Male ruddy ducks have blackish caps that contrast with bright white cheeks. In summer, they have rich chestnut bodies with bright blue bills. In winter, they are dull gray-brown above and paler below with dull gray bills. Females and first-year males are brownish, somewhat like winter males but with a blurry stripe across the pale cheek patch. In flight, ruddy ducks show solidly dark tops of the wings.
分类信息
The ruddy duck was formally described in 1789 by the German naturalist Johann Friedrich Gmelin in his revised and expanded edition of Carl Linnaeus's Systema Naturae. He placed it with the other ducks, geese and swans in the genus Anas and coined the binomial name Anas jamaicensis. Gmelin based his description on the "Jamaica shoveler" that had been described in 1785 by the English ornithologist John Latham from a specimen that he had received from Jamaica. The ruddy duck is now placed with five other species in the genus Oxyura that was introduced in 1828 by the French naturalist Charles Lucien Bonaparte. The genus name is derived from Ancient Greek oxus, meaning "sharp", and oura meaning "tail". The specific epithet jamaicensis means "from Jamaica". The Andean duck was formerly considered to be conspecific with the ruddy duck but with the two species split, the ruddy duck is monotypic: no subspecies are recognised.
- 学名
- Oxyura jamaicensis
- 命名信息
- (Gmelin, JF, 1789)
- 目
- Anseriformes
- 科
- Anatidae
- 属
- Oxyura
分布与栖息地
- 迁徙
- Complete migrants
保护状况
- 种群趋势
- declining
照片
分布
鸟叫声
其他鸟类
Burrowing Owl
Athene cunicularia
Small, long-legged owl of open grassy habitats. Appears brown at a distance with irregular white spotting. Yellow eyes. Typically found on the ground or perched on low fence posts or rocks. Active during day and night when it hunts mainly for insects and small mammals. When agitated, it stands erect and abruptly bows down. Nests in a burrow, often dug by a prairie dog or tortoise.
Black Siskin
Spinus atratus
Stunning and distinctive small finch of the high Andes; favors puna grasslands with shrubs, rocky slopes, and bogs. Black head and body is diagnostic among siskins; yellow wing and tail patches mostly concealed on perched birds, but very flashy in flight. Sexes look similar, but juvenile has an orangish bill and buffy wingbars. Feeds in low bushes and on the ground, sometimes in association with other small seed-eating birds, but also in small groups of its own kind.
Black Crake
Zapornia flavirostra
A small, pudgy, blackish waterbird with reddish eyes, a yellowish bill, and diagnostic pink-red legs. The immature is browner, with duller legs and bill. It scuttles along the edges of swamps and other water bodies, preferring reedbeds and emergent vegetation to forage on, sometimes quite boldly. Like most crakes, it walks tentatively with its head lowered, picking and probing for insects, plant matter, and other food. The distinctive call is an odd, wheezy bubbling and chattering “cheeew-t-t-t-t treeew, t-t-t-t-t-treew”.
开始您的观鸟之旅
在户外识别鸟类，并在下一次观察时随手查阅鸟类图鉴。