S I R S , -- I have observed no less than twenty-three instances between February 27th and March 7th, 1946, where one Rook (Corvus f. frugUegus) was either in or standing upon t h e nest with two attendant Rooks perched close together a t some twelve t o eighteen inches from t h e occupied nest, and remaining thus for periods of from t e n t o thirty minutes, even longer. This behaviour seems to b...

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