The dramatic decline in the numbers of House Sparrows Passer domesticus in the centre of London over the past 20 or so years is well documented and generally accepted (Summers-Smith 1999). Indeed, the matter of the decrease has already been raised twice in the House of Lords (Hansard 1.12.97, 3.2.99). There is now some evidence, albeit very slight, that this decline is not merely a London phenomen

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