Screaming Cowbird

Molothrus rufoaxillaris

Medium-sized cowbird found at woodland edges, savannas, and agricultural areas. Both sexes are entirely black with a bluish iridescence, except for rufous feathers on the underwing, which are difficult to see. Similar to Shiny Cowbird, but has a thicker bill and is notably less "shiny" that that species.

识别特征

The screaming cowbird has mildly iridescent black plumage; the lesser under-wing coverts are rufous. The female is slightly duller in colour than the male. The legs are black and the iris is reddish brown. Adult body length is 18–21 cm and mean adult weight is 58 g for males and 48 g for females. The call of the screaming cowbird was first described as "impetuous screaming notes"; however, a more useful description for field identification is noisy, explosive and piercing with rasp-like calls also produced. Screaming cowbirds are mostly seen in pairs or small flocks.

分类信息

学名
Molothrus rufoaxillaris
命名信息
Cassin, 1866
Passeriformes
Icteridae
Molothrus

分布与栖息地

Within South America, the screaming cowbird is found in north east and central Argentina, south east Bolivia, central Brazil and throughout Paraguay and Uruguay. Its natural habitat is pastureland where it forages amongst grazing animals such as cows, hence the name "cowbird". Similar to other cowbirds, it forages predominantly on the ground, eating invertebrates that have been disturbed by grazing stock. The distribution of the screaming cowbird has increased significantly in recent decades due to habitat alteration caused by deforestation and by following its hosts into new areas. Both female and male screaming cowbirds show high fidelity in roosting locations.

迁徙
Resident species

保护状况

种群趋势
stable

照片

分布

鸟叫声

其他鸟类

Taiwan Blue-Magpie

Taiwan Blue-Magpie

Urocissa caerulea

Large, long-tailed bird with rich blue plumage, black head, coral-red bill and feet, and yellow eye. Inhabits lower foothills to lower montane forests and edges (to 1200 m), occasionally venturing into forested parks. Forages in small flocks gliding from tree to tree. Long tail especially apparent in flight. Noisy; gives loud, sharp “kack” calls (much like Eurasian Magpie) and rasping notes.

Gray Wagtail

Gray Wagtail

Motacilla cinerea

Handsome long-tailed bird. Breeding male has a black throat, mostly yellow underparts. Breeding female often has some dark on the throat, paler yellow underparts. All plumages have gray head and back, with whitish eyebrow, bright yellow belly and vent. Often near flowing water with nearby rocks or surrogate rocky habitat, from mountain streams to weirs in suburban parklands. Walks quietly along shorelines or in nearby open areas, pumping its very long, white-sided tail up and down. Song is a repetitive series of high-pitched notes; calls include short, high “pseet” and buzzier flight calls.

Black-crowned White-eye

Black-crowned White-eye

Zosterops atrifrons

A small green songbird with a bold white eye-ring, a black forehead, and whitish underparts except for a yellow throat and undertail. Juveniles duller, with less black on forehead. Found in groups, often within mixed-species flocks, in forests, edges, and cultivated areas in lowlands and foothills. Separated from Lemon-bellied White-eye by whitish belly, and from Warbling and Sulawesi White-eyes by black forehead on Black-crowned White-eye. Song variable, comprising short, high-pitched warbles. Also gives chattering and twittering notes as well as “tzew” and repetitive “titititititit” trill calls.

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。