American Crow (Corvus brachyrhyncho here as Corvus americanus) and Brown-headed cowbird (Molothrus ater) from Pennsylvania bird life; a manual of the birds of Pennsylvania; treating especially of their food, from examinations of several thousand stomachs, made during all seasons of the year, with descriptions of the birds, their nests, eggs and habits by Warren, Benjamin Harry, 1858-1926 Publication date 1892
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