Swainson's Thrush

Swainson's Thrush breeds widely across boreal and montane forests of North America and undertakes one of the longest migrations among Catharus thrushes, wintering mainly in Central and South America. It is best known among birders for its ascending, spiraling flute-like song and its prominent buffy eye-ring, which gives it a distinctive 'spectacled' look.

• Body feathers: Evenly colored olive-brown to russet-brown across the back and tail, without strong contrast between them.
• Facial feathers: A bold, buffy eye-ring and lores create a 'spectacled' appearance, a key identification feature.
• Breast feathers: Buffy wash with dark spotting, often more extensive than in the Hermit Thrush.
• Compared to similar species: Unlike the Hermit Thrush, the tail is not noticeably more rufous than the back; the buffy eye-ring and evenly toned upperparts help separate it from Gray-cheeked Thrush, which lacks a strong eye-ring.

Sexes are alike, both showing olive-brown to russet-brown upperparts (varying somewhat by subspecies, with western populations often more rufous-toned), a buffy eye-ring, and a spotted buffy breast fading to white on the belly. Juveniles show pale spotting on the back typical of young thrushes before their first molt. A single annual post-breeding molt renews the plumage, with color intensity varying somewhat between the more olive eastern populations and more russet western populations.

Swainson's Thrush breeds in coniferous and mixed forest across Canada, Alaska, the northern United States, and higher elevations in the western mountains. It is a long-distance migrant, wintering primarily in Central America and the Andes region of South America, making it one of the farthest-traveling of the Catharus thrushes.

This thrush forages on the forest floor and in low vegetation, taking invertebrates and, especially during migration and winter, fruit. Its song is a distinctive series of flute-like notes that spiral upward in pitch, often delivered at dawn and dusk from within dense cover. Nests are built in shrubs or low tree branches. During migration, it is frequently detected at night by its distinctive flight call, a useful identification aid for observers monitoring nocturnal migrants.