T H I S paper is based on observations on House Sparrows (Passer domesticus) in an area of two square miles in north Hampshire. According to the Report of the Land Utilisation Survey (Green, 1940) " I t is an area of undulating relief . . .Three-quarters of the whole is under permanent pasture, much of it poor through indifferent drainage and used for feeding cattle, whilst there is also a high pro...

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