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[Colour illustration of a black bird on a tree branch. Forest and cottage in background] 
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J. Gould & H.C. Richter, del et Nth The 6th and last of a series of British Birds 
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ROOK - Corvus f. frugilegus. 
[italics] "Then rooks, the guttural talkers, three times or four repeat 
A clear cool note, and often up there in the treetop cradles. 
Charmed by some unfamiliar sweet impulse we cannot guess at. 
Gossip among the leaves : they leave when rain is over 
To visit again that baby brood, their darling nests." 
From Cecil Day Lewis' translation of the Georgics of Virgil. 
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