The approximately 180,000 birds of north-western Europe's shelduck population also spends their moulting season from July to September in the Wadden Sea, as do about 200,000 eider; and about 1,000 pairs of eiders use the mudflats of the North Sea as a breeding area.
Umbes 180 000 lindu Loode-Euroopa ristpardi populatsioonist veedab oma sulgimisaja juulist septembrini Wattenmeeril, nagu ka umbes 200 000 hahka; ja umbes 1000 paari hahku kasutab Põhjamere padumerd pesitsemisalana.