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Some thoughts on the identification of Gunnison's Red-backed Hawk (Buteo polyosoma) and why it's not a natural vagrant

Authors: Allen, S. E.
Year: 1988
Journal: Colorado Field Ornithologist, Vol. 22(1), pp. 9-14
Publisher: UNKNOWN
Keywords: ANIMAL BEHAVIOR, BUTEO POLYOSOMA, HAWK, ORNITHOLOGY, RMBL, SPECIES RANGE