The origin of British Aquatic Warblers

In his letter (Brit. Birds, 67: 443-444), Dr J. T. R. Sharrock made the hypothesis that the autumn records of Acrocephalus paludicola in Britain and Ireland are probably to be explained by a reverse migration of birds from Italy. On 14th September 1972, I found a dead example of this species on board the Belgian research ship Mechelen in the middle of the


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