Swainson's Thrush

Catharus ustulatus

Uniform medium-brown above from head to tail. Distinctive pale, buffy eyering and face separates Swainson's from other thrushes. Spots are concentrated and clearly defined on upper breast, becoming smudgier towards belly. Breeds in the boreal forest. Migrates to South America for winter; very rare in the U.S. after October, unlike Hermit Thrush. Its song is flute-like, ascending spiral like Veery in reverse.

识别特征

This species is 16–20 cm (6.3–7.9 in) in length. The wingspan averages at 30 cm (12 in) and the wing chord is 8.7–10.5 cm (3.4–4.1 in). The bill measures 1.5–1.9 cm (0.59–0.75 in) in length and the tarsus is 2.5 to 3.1 cm (0.98 to 1.22 in) long. This species' body mass can range from 23 to 45 g (0.81 to 1.59 oz). This thrush has the white-dark-white underwing pattern characteristic of Catharus thrushes. Adults are brown on the upperparts. The underparts are white with brown on the flanks; the breast is lighter brown with darker spots. They have pink legs and a light brown eye ring. Birds in the east are more olive-brown on the upperparts; western birds are more reddish brown. This bird's song is a hurried series of flute-like tones spiralling upwards.

分类信息

Genus: Catharus; Family: Turdidae; Order: Passeriformes.

学名
Catharus ustulatus
命名信息
(Nuttall, 1840)
Passeriformes
Turdidae
Catharus

分布与栖息地

The breeding habitat of Swainson's thrush is coniferous woods with dense undergrowth across Canada, Alaska, and the northern United States; also, deciduous wooded areas on the Pacific coast of North America.

繁殖区
NA : widespread
非繁殖区
MA, SA
迁徙
Complete migrants

行为

Migration pattern: Complete migrants.

保护状况

Population trend: stable.

种群趋势
stable

照片

分布

鸟叫声

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