Gray-Cheeked Thrush: "The Gray-cheeked Thrush is found in migration over
all the Eastern States, but breeds farther north, beyond our limits.
Bicknell's Thrush: "Bicknell's Thrush, a closely related form, while
having somewhat the same general range, breeds farther south and
nests in the mountains of northern New York and New England. The
species does not seem to be very abundant anywhere."[158]
Their resemblance to each other and to the olive-back makes them
difficult to identify. The absence of buff from the head
differentiates them from the latter species, which is a difference
not readily observed except by experienced ornithologists.
Bicknell's thrush is smaller than the gray-cheeked thrush.