The Bicknell's Thrush is a species of highest conservation concern in North America. This is due to their small population, limited breeding and wintering ranges, and vulnerability to deforestation in its winter habitat. Difficult to differentiate from the closely related Gray-cheeked Thrush, they weren't recognized as a distinct species until 1995. This individual responded to recorded bicknell's call, but did not to gray-cheeked calls. Here's a page of multimedia resources for Bicknell's Thrush identification. I have more photos of this individual here.
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