Swainson's thrush (Catharus ustulatus), also called olive-backed thrush, is a medium-sized thrush. They are currently the most abundant and widely distributed spot-breasted thrush in Washington. The Gray-cheeked Thrush is similar, but has grayish cheeks and lacks conspicuous eye ring. The eight species found regularly in Washington have a diet that varies seasonally between insects and other invertebrates in the summer, and berries in the winter. Bird Pictures with names from around the world, Swainson’s thrush (Catharus ustulatus)from Wikipedia: These birds migrate to southern Mexico and as far south as Argentina. Auk 73:313-353. Olive-brown above with a distinct buffy eyering. 1992. Its relatively short feet and long wings may be adaptations for arboreal foraging. Catharus ustulatus. Vaginal yeast infection, also known as candidal vulvovaginitis and vaginal thrush, is excessive growth of yeast in the vagina that results in irritation.
Swainson’s thrushes are widespread migrants through the South and appear in a variety of shady migration stops, from local parks and backyards to mountain ranges and coastal migration hotspots.
Swainson's Thrushes appear to benefit from the extensive logging of low-elevation west-side forests because logging leaves brushy, early-successional habitat. Population declines and even disappearances cloud the future of this melodious species. East of the Cascades, they are found at higher elevations than in the west, because eastern forests are more open, and have more understory, than the dense, west-side forests. However their brains are relatively large and their learning abilities are greater than those of most other birds. The thrushes are a large family of songbirds found worldwide. Recent Wood Thrush (Hylocichla mustelina) research suggests that deforestation on the wintering grounds might be driving overall population declines in that species. It winters in primary and, to a lesser extent, secondary forests and edges of many types.
They have disappeared from many locales that they once inhabited in California, for example in coastal areas and in some of the major interior valleys. Nest failure rates in this species are very high, sometimes exceeding 60 percent; it is believed that most females never nest successfully.
Beetles, caterpillars, and ants are among the principal insect prey; few temperate songbirds exploit ants to the extent that this and related species do.
This may facilitate rapid pairing, important in high-altitude, northern regions where the breeding season is short. Like other thrushes, Swainson's Thrush is omnivorous, eating mostly insects during spring and summer and fruits in fall and winter. It uses a variety of foraging techniques, especially pecking and gleaning (typical of thrushes) but also aerial-lunging, hovering, and fly-catching. The name changed in part because some Swainson’s thrush populations have brownish backs and also because the olive-like tone seen in others—which varies with light conditions—is much like that of gray-cheeked, Bicknell’s, and hermit thrushes. Members of this diverse group make up more than half of the bird species worldwide. Western populations migrate both north and south along the Pacific coast and winter in tropical Mexico and Central America.
Males and females appear similar in most species. Smithson.
Olive-backed Swainson’s Thrush spend the winter in tropical forests of northern South America.
The name changed in part because some Swainson's thrush populations have brownish backs and also because the olive-like tone seen in others—which varies with light conditions—is much like that of gray-cheeked, Bicknell's, and hermit thrushes. Home » Learn » Bird Identification Guide » Thrushes & Allies » Swainson’s Thrush. Fall migration takes place during August and September. During fall and spring migration, their soft, bell-like overhead “peeps” may be mistaken for the calls of frogs. Swainson’s Thrush winter (red) in tropical forests of Mexico, Central America, and South America. In most areas, it avoids competition with these species by utilizing different elevations, foraging strategies, or habitat. 1985. They arrive late in spring, and migration is spread out, with spring migrants appearing in late May in eastern Washington. ; Mistle Thrush (band), an alternative rock band based in Boston, Massachusetts Thrush Hermit, a Canadian alternative rock band active in the 1990s; The Deception of the Thrush: A Beginners' Guide to ProjeKcts, a King Crimson album; Tiger Thrush, an album by Japanese vocalist Ami Yoshida During migration, you may find Swainson’s and other thrushes doing the same thing as they dine on wild grape and other berries. Swainson's Thrush occurs in two subspecies groups, the "Russet-backed Thrush" of the western boreal region and Pacific coast and the "Olive-backed Thrush" of the eastern boreal region, Rockies, and Appalachians. Russet-backed Swainson’s Thrush breed only in forests along the Pacific coast of North America. Points indicate annual estimate of relative abundance; higher numbers mean more Swainson’s Thrush were counted in that year. The coastal subspecies migrate down the Pacific coast of North America and winter from Mexico to Costa Rica, whereas the continental birds migrate eastwards within North America (a substantial detour) and then travel southwards via Florida to winter from Panama to Bolivia.
There are three species of spot-breasted thrushes found in Washington. Swainson’s Thrush numbers have decreased across Canada and the United States according to the Breeding Bird Survey.
Continued research and monitoring is necessary to understand the factors driving population change in Swainson’s Thrush. These forms differ in plumage, breeding habitat, winter range, and certain vocalizations. 1996. If you find the information on BirdWeb useful, please consider supporting Seattle Audubon.
In its forest breeding grounds, the Swainson’s thrush builds sturdy cup nests using grass, bark, leaves, and other plant materials, lining these structures with softer materials. Philadelphia: The Academy of Natural Sciences; Washington, D.C.: The American Ornithologists' Union. Find out why and see all selected boreal birds ».
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