...The old rook was simply expressing the old truth, that life was worth living... 
W. H. Hudson 「Birds in Town and Village」
...The rook paid no attention until she was almost on it...
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」
...Clearly,a Rook would have done me a service by uprooting the first lettuce,and capturing its destroyer...
Rev. C. A. Johns 「British Birds in their Haunts」
...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」
...The rook is gregarious, in which particular it differs fromthe Carrion Crow which lives in pairs...
Various 「Natural History in Anecdote」
...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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