T H E following notes, made on a colony of Rooks (Corvus frugilegus) in a Cambridge street during March, 1949, have been prompted by Mr. C. M. Ogilvie's article on this subject (antea, pp. 1-5). This rookery, comprising only five pairs, was a new one, probably caused by an overflow from an over-crowded rookery about half a mile away. The birds flew off to roost towards this main rookery until Marc...

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