I think that it is difficult to gauge size from that picture. The white throat patch is typical of a GHO, and if it had a 4' wingspan, it is indeed a GHO. It will continue to try for your birds. They are tenacious and patient killers.
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When you see/hear these owls, is there a faint skunk odor in the air? I can usually smell the owls before I hear them. GHO's love skunk meat.