Glen I had to laugh at myself because I made a wrong assumption when I saw the greyed circle at the owls foot. First I thought you were drawing attention to some detail, then I thought no...perhaps it is the focusing area of the lens showing up....then when I looked at the next photo...DOH! it is a wind speed propeller....had me going with this one. I enjoy your work, Thanks for posting the galleries. See you on "bird pix".
Ed