The Dutch Wadden Sea is of international importance for Common Eiders Somateria mollissima, with between 102,000 and 173,000 individuals spending the winter there. In the winter of 1999/2000, beached bird surveys detected a mass mortality event, with the numbers recovered being 3.3-12.8 times higher than the longterm monthly averages. It was estimated that 21,000 eiders died during the winter. The

...

Stay at the forefront of British birding by taking out a subscription to British Birds.

Subscribe Now