...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」
...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」
...Even artificial nests, with suitable suppliesof food, have succeeded, and it seems thatthe rook is nowhere a very difficult neighbourto attract and establish...
Frederick G. Aflalo 「Birds in the Calendar」
...The most important problem however inconnection with the rook is the precise extentto which the bird is the farmer's enemy or hisfriend...
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」
...Further differencesare found in the feathering of the head and neck of thesebirds, that of the crow being much more completely coveredthan that of the rook...
Various 「Natural History in Anecdote」
...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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