OGILVIE OBSERVATIONS on Rook (Corvus frugilegus) behaviour during the incubation period and in winter have been recorded in previous issues of British Birds (antm, vol. xl, pp. 135-139, and xlii, pp. 65-68). The notes which follow are based on a study of the same rookery in the period March 8th-i9th, 1948. Particular attention was paid to building activity, but other behaviour of a significant or...

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