the numbers of Blackbirds Turdus merula, as a result of the severe weather of 1962/63, in an area closely studied by the author for fourteen years. The ornithology of this study area of some 546 acres at Dollis Hill in north-west London has already been described by the author at length (Simms 1962). However, the exceptionally cold weather of 1962/63, unlike that of 1955 and 1961/62, had an appreciab...

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