The Chestnut-sided Warbler, Setophaga pensylvanica, is often confused with its close relative the Bay-Breasted Warbler, Setophaga castanea, with their shared chestnut-colored streaks. But the Chestnut-sided has a bright yellow cap and a white throat with his black mask, whereas the Bay-breasted has a dark head and chestnut throat.
Black Swamp Bird Observatory, Ohio, USA
©Two Loons/Erin Lehnert
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