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Swainson's thrush
Territorial disputes between males often take the form of singing duels, with song volume and frequency escalating until the combatants’ physical exertions are clearly evident.
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Swainson's thrush
Swainson's thrush
Swainson's thrush (Catharus ustulatus)
Swainson's thrush
Swainson's thrush (Catharus ustulatus)
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