Trends in the population of British wintering ducks 1961-64

G L Atkinson-Willes, J C Frith


The data available through the National Wildfowl Counts are used to keep a running check on the numbers of wildfowl occurring in Britain during the winter months from September to March. Each month a brief report is sent to all observers engaged in the investigation, and it is these which provide the basis of.

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