I invite corrections from more knowledgeable folks, but my conversations
with Ohio raptor experts remind me that the dark-plumaged red-tailed
hawks of Ohio are most often reported in our northwestern corner, and
are simply a small tribe among our resident red-tails. Real calurus from
out west are possible of course but quite rare; they are noticeably
smaller, and pretty much non-migratory in their home range. There's an
1895 specimen in the OSU Museum that was said to be a calurus, but
decades later was determined to be local borealis with dark feathering
(determined by Oberholser); I don't know if genuine calurus specimens
from Ohio exist.
Bill Whan
Columbus

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