Rooks are highly gregarious birds and are generally seen in flocks
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Rook Bird Facts (Corvus frugilegus)
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Darwin, C. R. ed. 1841. Birds Part 3 of The zoology of the voyage of H.M.S. Beagle. by John Gould. Edited and superintended by Charles Darwin. London: Smith Elder and Co.
Rook Bird Facts (Corvus frugilegus)
Gregarious Species Stock Photos and Pictures - 12,873 Images
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