frugilegus) carried out while I was holding a Nature Conservancy Post-Graduate Studentship at the Edward Grey Institute, Oxford, in 1952 and 1953. All four rookeries concerned were within 10 miles of Oxford and were on rather similar farming land. T h e food obtained refers t o t h e first three weeks of the nestlings' life, a period previously ignored in work on the food of Rooks. I am grateful t ...

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