Larger, with a longer tail than a rock pigeon; blue-gray on the upper parts ... Adult male: gray on the head, and breast tinged pinkish; narrow white half-collar across the upper hind neck ...
Michael L. Casazza, Julie L. Yee, Michael R. Miller, Dennis L. Orthmeyer, Daniel R. Yparraguirre, Robert L. Jarvis, Cory T. Overton https://www.jstor.org/stable ...
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