Return to Main Page   Dakota Birder Blog    

Swainson's Thrush

Catharus ustulatus

Length: 7 inches Wingspan: 11.5 inches Seasonality: Migrant / Summer
ID Keys: Grayish-white underparts, buffy breast with spots, buff throat and cheeks, buffy eye-ring, pink legs.

Swainson's Thrush - Catharus ustulatusA common migrant through the state, Swainson's Thrushes are often found in mixed flocks with other similar thrushes. They can be confused with species such as Hermit Thrush, although the warm rusty rump of a Hermit Thrush is a clear differentiating feature. Gray-cheeked Thrushes are the species most similar in appearance, and the subtle plumage differences can sometimes make them difficult to differentiate. However, Gray-cheeked Thrushes are generally much less common than Swainson's Thrushes, and while Swainson's Thrushes do breed in the Black Hills of South Dakota, Gray-cheeked Thrushes are only migrants in the state. Generally a shy bird, Swainson's Thrushes are often considered a difficult bird to observe. In South Dakota, that's generally true for breeding birds in the higher elevations of the Black Hills, but in migration, they can often be found cautiously foraging in open grassy areas adjacent to woodland edges, flitting back into cover when disturbed.

Habitat: Nearly any kind of wooded habitat during migration and in the winter.  During this time of year they are often found along woodland edges, foraging in adjacent open areas but using the woodland itself for cover and roosting. They use conifer forests for breeding throughout most of their normal range, although they will use deciduous forest in a few breeding locations in North America. They prefer forests with a dense understory, as nesting is primarily done in small shrubs and sapling of the understory.

Diet: Mostly insects, earthworms, and other invertebrates.  However, during migration they will also sometimes feed on fruits and berries.

Behavior: Often foraging on the ground, walking or hopping a short distance, pausing and looking, before moving on again.  Also forages quite often in the foliage and branches of trees and shrubs, and may occasionally fly out from an observation perch to capture passing insects in mid-air.

Nesting: June and July. The nest is a cup built of a variety of vegetative material including twigs, dead leaves, grasses, weed stems, and strips of bark, lined with finer twigs, rootlets, and mosses. The female alone builds the nest, placing it on a branch of a small tree or bush in conifer forest areas with a healthy understory.  She lays 2 to 5 eggs, and she alone incubates them. The young hatch after 12-14 days, and fledge from the nest 10-14 days after hatching.

Song: Swainson's Thrush Song. The song consists of a series of sweet, musical phrases, high-pitched but with different tones for each note.

Migration: Summers throughout much of Canada, the Great Lakes region, the Northeastern U.S., and much of the Western U.S.  Winters in southern Mexico and points south.

Interactive eBird map: Click here to access an interactive map of Swainson'sThrush sightings

Similar Species: Veery, Hermit Thrush, Wood Thrush, Gray-cheeked Thrush. Gray-cheeked Thrush is the species most similar in appearance.  The eyering on a Swainson's Thrush is typically buffy and more prominent than the whiter, weaker eyering of a Gray-cheeked Thrush. Gray-cheeked Thrushes also lack the buffy tones on the cheek and upper breast that are generally found on Swainson's Thrushes.

South Dakota "Hotspot": During the spring migration in the first two-thirds of May, Swainson's Thrushes are typically quite easy to find in appropriate habitat. During that time of year it's more about timing and appropriate habitat than it is about one specific "hotspot".  They prefer being around woodland edges, but with open grassy areas to forage in at this time of year. Because of those habits, state parks in the eastern part of the state are good places to find Swainson's Thrushes, as they will often forage in the open, managed grassy areas that about riparian forest and other woodlands that are often found in eastern state parks.  During the summer months, they also can be found as breeding birds in higher elevations of the Black Hills, but they are not as easy to observe on their breeding grounds as they are in migration.

Feeders: Not a species that normally attends feeders, during migration they will occasionally stop for offered fruits.

Conservation Status: There is evidence of declining populations in recent decades, but overall populations are strong, and they are found across a wide geographic area. The IUCN considers the Swainson's Thrush to be a species of "Least Concern".

Further Information: 1) Patuxent Bird Identification InfoCenter, Swainson's Thrush

2) Audubon Field Guide - Swainson's Thrush

3) WhatBird -- Swainson's Thrush

Photo Information: May 17th, 2011 - Minnehaha County, South Dakota - Terry Sohl

Additional Photos: Click on the image chips or text links below for additional, higher-resolution Swainson's Thrush photos.

 

Click on the map below for a higher-resolution view
Swainson's Thrush - Range Map
South Dakota Status: Common spring migrant throughout the state, less common in the fall.  Swainson's Thrushes also breed in the higher elevations of the Black Hills.

Additional Swainson's Thrush Photos
Click for a higher-resolution version of these photos
Swainson's Thrush - Catharus ustulatusSwainson's Thrush - Catharus ustulatusSwainson's Thrush - Catharus ustulatusSwainson's Thrush - Catharus ustulatusSwainson's Thrush - Catharus ustulatusSwainson's Thrush - Catharus ustulatusSwainson's Thrush - Catharus ustulatusSwainson's Thrush - Catharus ustulatusSwainson's Thrush - Catharus ustulatusSwainson's Thrush - Catharus ustulatusSwainson's Thrush - Catharus ustulatusSwainson's Thrush - Catharus ustulatusSwainson's Thrush - Catharus ustulatusSwainson's Thrush - Catharus ustulatusSwainson's Thrush - Catharus ustulatusSwainson's Thrush - Catharus ustulatus