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according to season aircraft average Baltic Sea bers birds in autumn birds was recorded birds were recorded breeding coast coastal colonies common eider Common Scoter compared countrywide aerial surveys countrywide surveys coverage Danish waters decrease Denmark Density differences Dispersion ducklings eider Somateria mollissima Ertholmene estimated from countrywide feeding females flocks Geographical distribution geographical sections geographical variation Gull high numbers Internationally important numbers islands K˛nigshafen large numbers Laursen Limfjorden Long-tailed Duck majority of birds migration mild winters moulting mussel mussel beds Mute Swan Nehls nests Noer North Sea northern Kattegat Norwegian Trench Numbers in geographical numbers of birds numbers recorded observed period predation Residual population Rose & Scott seaducks Seasonal and geographical severe winter Skagerrak southwestern Kattegat SP LS species spring SP Stavns Fjord Swan Swennen tion Total numbers Tufted Duck Velvet Scoter Vlieland Wadden Sea waterbirds waters during late Whooper Swan winter of 1987