T H I S P A P E R is based on over 800 weights of Bullfinches Pjrrhula purrhula from the deciduous woodland of Wytham Estate, hear Oxford, from September 1962 to March 1964. The birds were weighed on a spring balance sensitive to 0.1 gram, which was checked about once each month.The Bullfinch is characteristically a bird of woods and hedgerows; it feeds largely on buds in spring, and for the rest ...

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