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Chris F. Mason, Auteur ; Sheila M. Macdonald, AuteurDans Wildfowl (51 2000)Waterbirds were counted on three occasions during the winter of 1999-2000 on 22 1-km reaches of river in north Essex and south Suffolk, eastern England. Fourteen species were recorded but only five were frequent: Little Grebe (Tachybaptus rufico[...]
