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Introduction : Swainson’s Thrush is a medium sized (15-18cm) thrush which prefers to breed in dense shrub growth associated with spruce-fir forests. The "russet-backed" race prefers mixed forests and deciduous riparian woodlands of the coastal region from British Columbia, to northern California. These Pacific populations winter in mature tropical and secondary forests of Central America, whereas the "olive-backed" race that breeds in the Boreal and Rockies winters in S. America. Models of Monitoring Avian Productivity and Survival (MAPS) demographic data and high-resolution land cover data showed that Swainson’s Thrush prefers large intact forest patches with low perimeter to area ratios. On a regional...
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( "pnr_lat_grid" * 0.08576) + (0.01474 * "nlcd01cc10k") - (0.02902 * "nlcd06af90pr") - (0.45815 *"gtopo30_ln). Trimmed with 990m-resolution masks representing the forest layer (NLCD 2006) and excluding cells in which agriculture covers greater than 33% of area. Range of adults allowed was 0-55 representing 95% confidence limits of input data.


    map background search result map search result map BBS Swainson's Thrush Swainson's Thrush Adult Capture (<33% agri) Swainson's Thrush predicted wing length gradient Swainson's thrush - Summer Wing Length Gradient Swainson's Thrush - Predicted Productivity Index Swainson's Thrush range map Swainson's Thrush detections (EBird records May-Jul) Swainson's Thrush detections (EBird records May-Jul) Swainson's thrush - Summer Wing Length Gradient Swainson's Thrush Adult Capture (<33% agri) Swainson's Thrush - Predicted Productivity Index BBS Swainson's Thrush Swainson's Thrush predicted wing length gradient Swainson's Thrush range map