Short answer…No, this bird is probably not a Bicknell's Thrush.
From Cornell's Birds of North America Online:
"Gray-cheeked and Bicknell’s thrushes very similar in appearance and difficult to identify, especially in the field. Slight average differences in color of plumage and bare parts exist, but these less reliable for identification than differences in vocalizations
and morphometrics (Ouellet 1993
). Body coloration of both species varies across respective breeding ranges, obscuring differences in all but extreme variants."
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