...The old rook was simply expressing the old truth, that life was worth living... 
W. H. Hudson 「Birds in Town and Village」
...The rook went on with its business, and after that there was no more quarrelling...
W. H. Hudson 「Birds in Town and Village」
... Another morning this same old rook came with his mate to the field: separating, they came down a distance of a hundred yards or more apart and began searching for grubs...
W. H. Hudson 「Birds in Town and Village」
...But it is not the same as that which has served to preserve the rook and made it so common...
W. H. Hudson 「Birds in Town and Village」
... the Rook insome green rookery of the Old World...
Various 「Birds Illustrated by Color Photograph [April, 1897]」
...Like the rest ofits tribe, it is omnivorous, and lives in societies, like the commonJackdaw and Rook, but rarely deserting, and then only when pressedby hunger, the place of its birth...
Rev. C. A. Johns 「British Birds in their Haunts」
...On the one hand, it seems undeniablethat the rook eats grain and potatoshoots...
Frederick G. Aflalo 「Birds in the Calendar」
...In the midst ofthese playful exertions it unfortunately happened that one rook, by asudden turn, struck his beak against the wing of another...
Percy J. Billinghurst 「A Hundred Anecdotes of Animals」
...It is only when the rook in his turn gets too numerous thathe needs a similar check...
Various 「Natural History in Anecdote」
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