Swainson's Thrush (Catharus ustulatus) lives in coniferous forest across North America. It feeds on insects and fruit. Its conservation status is Least Concern.
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Coastal Swainson's thrushes hug the Pacific shoreline, wintering from Mexico to Costa Rica, while their continental cousins take a massive inland detour: they first head east across North America, then swing south through Florida to reach winter homes from Panama to Bolivia. This roundabout route, documented as a "substantial detour," shows how historic ice-age pathways still shape modern migration, forcing birds to travel extra miles for suitable stop-over habitats.
Four recognized subspecies fall into two genetic clades that split about 10,000 years ago, right as the last ice age melted. Molecular work shows the continental and coastal groups diverged in the Late Pleistocene, swift north-west expansion into newly opened forests. the thrush is the most ancient North American Catharus species yet still shows convergent looks with its relatives.
A stomach-content study in the eastern United States found insects dominate the diet at 63.5 %, with beetles (16 %), ants (15 %), true bugs (11 %), caterpillars (10 %) and flies (6 %) making up the bulk. The remaining 36.5 % of food are fruits, especially berries from the Ericaceae family.
Breeding territories are tiny, often just 1 to 2.1 ha, though in Ontario they can stretch from 0.12 ha up to 5.14 ha. Nests are typically placed 3 m off the ground, and the defended space rarely extends beyond the immediate nest area, with some territories reaching 6.1 m high.
Swainson's thrush measures just 16-20 cm long, about the length of a standard ruler, with a wingspan averaging 30 cm. Its bill is only 1.5-1.9 cm and the tarsus 2.5-3.1 cm, while the bird weighs between 23 and 45 g.
Sources
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In the shadowy depths of the forest, the Swainson's Thrush moves with a quiet purpose, its delicate form weaving through the underbrush with a soft rustle of leaves and snapping of twigs. As it migrates across the continent, this unassuming songster traverses a vast and varied landscape, its earthy tones and subtle beauty allowing it to blend seamlessly into the surroundings, even as its melodic voice rises like a whispered secret on the evening breeze. With each fleeting glimpse, the Swainson's Thrush reveals itself to be a master of understated elegance, a true marvel of evolutionary refinement.
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