Rooks are highly gregarious birds and are generally seen in flocks of various sizes. Males and females pair-bond for life and pairs stay together within flocks. In the evening, the birds often
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Canada Goose John James Audubon's Birds of America
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The Living Animals of the World, Volume 2 (of 2) , Frederick G. Aflalo et al.
Territory in Bird Life by H. Eliot Howard.
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Territory in Bird Life by H. Eliot Howard.
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