Range. With the great powers of flight (they do migrate to South America! Swainson’s Thrush breeding range from 2nd PBBA compared with 1st PBBA. Swainson's Thrush Catharus ustulatus During the peak of migration, Swainson's Thrushes are often very common in woodlots and parks, lurking in the thickets, slipping into fruiting trees to pluck berries. ... Swainson's Thrush Catharus ustulatus. Timing and Routes of Migration. Adult (Russet-backed) Adult (Olive-backed) Adult (Olive-backed) Adult (Russet-backed)
range, Swainson’s Thrush eggs are generally laid from mid-April to late June, with latter dates presumed to be renests (Evans Mack and Yong 2000). In california the breeding range of this species has contracted during the last century and the disappearance of the swainsons thrush from yosemite valley is one of the unsolved mysteries of sierran ornithology marshall 1988. In Birds of the World (A. F. Poole and F. …
Potential contact in their breeding ranges occurs mostly in British Columbia, and research there has highlighted differences between the groups. Breeds in the boreal forest. Swainson’s Thrush Seasonal Range Habitat. Strongly associated with coniferous forests (spruce-fir; Garrett and Dunn 1981). Migratory Behavior. Distinctive pale, buffy eyering and face separates Swainson's from other thrushes. This range includes that of the race almae, which did not appear in the 1931 Check-list. Experiencing a loss of about 38 between 1966 and 2014 according to the north american breeding bird survey. But the Veery and Gray-cheeked Thrush have smaller breeding ranges, and the Wood Thrush breeding area occurs in the eastern United States, primarily east of central Oklahoma.
Migration Overview.
Found in coastal Douglas- hemlock forests in the Pacific Northwest (Jewett et al. Movements and Migration. Habitat in Nonbreeding Range. Swainson’s Thrush in Oakville, Ontario, in September 2016. Habitat in Breeding Range. Swainson's Thrush: Medium-sized thrush (swainsoni), with dull olive-brown or olive-gray upperparts, pale buff eye-ring, dark moustache stripe, and brown-spotted buff throat and breast, and white belly. Flies in a swift, direct flight with rapid wing beats.
Swainson's Thrush Identification. It turns out that the Hermit Thrush has a breeding range that is even larger than the breeding range of the Swainson’s Thrush—which covers much of Canada and up into Alaska. Dr. H. C. Oberholser (1898), in naming and describing Alma's thrush, says: "The present race differs from the eastern HylocieAlo~ u.stukzta swainsonii in the more grayish, less olivaceous color of the upper surface, this being usually more noticeable on the rump and upper tail-coverts. No evidence of breeding on 15 of 16 Sierra study sites currently monitored throughout historic range (see map). Unlike many birds, it often sings while on migration. Olive-brown above with a distinct buffy eyering. Legs and feet are pink-gray.
Uniform medium-brown above from head to tail. During fall and spring migration, their soft, bell-like overhead “peeps” may be mistaken for the calls of frogs.
Migrates to South America for winter; very rare in the U.S. after October, unlike Hermit Thrush. These largely arboreal foragers pluck berries, glean bugs from leaves, or perch on branches and stumps. Spots are concentrated and clearly defined on upper breast, becoming smudgier towards belly. ), this species is quite capable of colonizing new areas and expanding its range as opportunities occur. Title Swainson's Thrush Range - CWHR B385 [ds1610] Publication date 2016-02-0100:00:00 Presentation formats digital map FGDC geospatial presentation format vector digital data Other citation details These are the same layers as appear in the CWHR System software. The species' wintering range includes habitat in many ABC-supported reserves, including El Paujil and El Dorado in Colombia, Abra Patricia in Peru, and Tapichalaca in Ecuador. Although Russet-backed and Olive-backed types do interbreed, the hybrid zone between them is narrow — only about 50 miles wide in the best-studied spot. Bay Delta Bioregion: BREEDING ONLY ALONG COAST IN …
1953). Swainson’s Thrush absent from historic range in Yosemite Valley since 1928 (Gaines 1992) and Eshom Creek, Whitaker’s Forest in southern Sierra Nevada in 1980’s, where they had been abundant in the 1930’s (Marshall 1988).