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A Hybrid Red Crossbill-Pine Siskin (Loxia curvirostra × Carduelis pinus) and Speculations on the Evolution of Loxia
Dan A. Tallman and Richard L. Zusi
Vol. 101, No. 1 (Jan., 1984), pp. 155-158
Published by: American Ornithological Society
Stable URL: http://www.jstor.org/stable/4086235
Page Count: 4