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Sorry for the late post, but on 12/26, while cleaning the most recent batch of snow off my car, I heard a low-pitched, guttural GROK call, repeated three times. I looked up expecting to see a Raven, but instead saw a largish "hawk," very light colored underneath. It was flying away from me, at a distance of several hundred feet when I first saw it. Of course, I didn't have binoculars. The Gyrfalcon would seem to be the only hawk-like bird with such a deep call. Sibley describes it as a "deep, hoarse kwah, kwah, kwah." I have been unable to find a recording of this call either on tapes/CDs that I own or on the internet. Lacking other visual identification, is this call a good bet for a Gyrfalcon? Ken Copenhaver Fairfax VT