IN 1957, observations were made for the eighth year in succession on the departure flights of Shelduck (Tadorna tadorna) from the River Mersey estuary at W e s t o n , near Runcorn, Cheshire, and details are given in Table I. The moult migration in 1955 and 1956 has already been described in British Birds (antea, vol. xlix, pp. 221-226; vol. L, pp. 344-346) and readers are referred to the map whic...

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