CommentNarrow specialist. You can download select species by searching or when you're on a Taxa page like Class, Order, and Family. Threat is moderate to severe and imminent for a significant proportion (20-60%) of the population or area. In winter, they feed on berries, seeds, and acorns, in trees or shrubs or on the ground. Missoula, MT: Mountain Press Publishing Company. Foresman, K.R. CommentBreeding Bird Survey data has moderate credibility in Montana and shows an insignificant decline of -6.7% per year or 51% decline per decade. They are aggressive and dominate many other feeder bird species. Most thrushes are not always common backyard birds, but attracting them can be rewarding because it means developing a rich, bird-friendly habitat to lure these shy species. They head down into the lowlands in winter. Oscines are capable of more complex song, and are considered the true songbirds. Members of this diverse group make up more than half of the bird species worldwide. The thrushes are a large family of songbirds found worldwide. Both males and females feed nestlings. ... lacks orange throat and supercilium and flank pattern of varied thrush. The female lays 3-4 eggs that she incubates. Throat and breast feathers are buff instead of orange. CommentFire, timber harvest, and insect outbreak related to climate change are the greatest threats to the species due to its reliance on mature mesic conifer forests. Hendricks, C.R. CommentSpecies favors mesic conifer forests which, in the Northern Rockies, have remained relatively stable within +/- 25% of pre European levels. Breeds in mature, wet forests in the Pacific Northwest; found in a broader range of wooded habitats with fruiting plants in winter. Montana Cooperative Wildlife Research Unit, University of Montana, Missoula, MT. Much of its foraging is done on the ground, usually in dense cover, although sometimes it forages on open lawns and roads. Loss of suitable breeding habitat due to forestry practices, insect outbreaks, and wildfires reduce breeding populations. R1-93-34. During migration and in winter, it frequents ravines and thickets, especially near streams. The varied thrush is a fairly large thrush species. The song of this species is distinctive: a long, whistled tone about two seconds in length with a pause of three to 20 seconds between each tone. Collisions with windows also contributes to mortality of the species (George 2000). The Varied Thrush is a rare host of the Brown-headed Cowbird, which generally avoids dense forested habitats (George 2000). Young. Publication No. ScoreF - 20,000-200,000 km squared (about 8,000-80,000 square miles). Peterson, and R.L. • Varied Thrushes eat a combination of insects and berries, shifting seasonally. It repeats this pattern for 10 minutes or so from a high perch in a conifer, and then flies to a new perch and begins again. In summer, they prey on insects and other invertebrates. 1991). 3.5 + 0.25 (population size) + 0.0 (geographic distribution) - 0.5 (short-term trend) - 0.75 (threats) = 2.5. Immature birds are similar to adults except the head and neck are brown tinged with buff with an indistinct orange eyebrow. Thornton, K.P. While similar in size and shape to the American Robin (another species of thrush), the Varied Thrush has much more prominent markings on the breast and head. There are two subspecies found in Washington, separated by the Cascades. The wings are boldly patterned with slate, black, and rust. The song is most often heard at dawn, dusk, and after a rain shower. Mountain Press Publishing, Missoula, Montana. Winter range may depend on severity of weather. Performance & security by Cloudflare, Please complete the security check to access. Completing the CAPTCHA proves you are a human and gives you temporary access to the web property. They raise two broods in a season when possible. Bird song is primarily a behavior of the nesting season. Highest number of observations during the breeding season are in northwestern Montana. The breast and neck are a bright orange, separated by a black chevron at the throat. 2004); Evaluating structural characteristics and distribution of each ecological system relative to the species' range and habitat requirements; Examining the observation records for each species in the state-wide point observation database associated with each ecological system; Calculating the percentage of observations associated with each ecological system relative to the percent of Montana covered by each ecological system to get a measure of "observations versus availability of habitat". It can range from 20 to 26 cm (7.9 to 10.2 in) in length and can span 34 to 42 cm (13 to 17 in) across the wings. The Varied Thrush is unmistakable with its black and orange plumage and ethereal song. Comment139,977 square kilometers based on Natural Heritage Program range maps that appear on the Montana Field Guide.