... 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」
... or farmer's journal as "even worse than the rook...
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」
...They have also been observed to chase and kill small birds, which,as near starvation as themselves, have been unable to fly beyondtheir reach, and I have even seen a Rook catch a small fish...
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」
...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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