Not safely separated from its sibling species, the Western Wood-Pewee (C. sordidulus), except by song. The clear pee-ah-wee! song of the Eastern is distinct from the harsh, buzzy, peeer of the Western.
The paler breast suggests an Eastern, but the Western's breast is pretty variable. The lower mandible is pretty dark for an Eastern, but that's variable, too, and in hatch year Easterns the bill is dark.
AR is near the westerly range limit for Easterns and the easterly limit for Westerns, but decent odds it's an Eastern. If you heard its call and remember it, you can be a little more definite...
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The paler breast suggests an Eastern, but the Western's breast is pretty variable. The lower mandible is pretty dark for an Eastern, but that's variable, too, and in hatch year Easterns the bill is dark.
AR is near the westerly range limit for Easterns and the easterly limit for Westerns, but decent odds it's an Eastern. If you heard its call and remember it, you can be a little more definite...