Editing Greater scaup (section)

==Distribution and habitat==
The greater scaup has a circumpolar distribution, breeding within the Arctic Circle both in the Old World (the [[Palearctic realm|Palearctic]]) and in North America (the [[Nearctic realm|Nearctic]]). It spends the summer months in [[Iceland]], east across [[Scandinavia]], northern [[Russia]] and [[Siberia]], [[Alaska]], and northern [[Canada]]. It is mostly migratory, but small numbers are present in Iceland and the [[Aleutian Islands]] year round.<ref name=Birdlife/> The summer habitat is marshy lowland [[tundra]] and islands in fresh water lakes. In the autumn, greater scaup populations start their migration south for the winter. They winter along the Pacific and Atlantic coasts of North America, the coasts of northwest Europe, the [[Caspian Sea]], the [[Black Sea]], the coast of Japan, [[Yellow Sea]] and [[East China Sea]].<ref name=EuropeBirdguide/> During the winter months, they are found in coastal bays, [[estuaries]], and sometimes inland lakes,<ref name=BirdsNorthAmerica/> such as the lakes of [[Central Europe]] and the [[Great Lakes]].<ref name=EuropeBirdguide/>

In Europe, the greater scaup breeds in Iceland, the northern coasts of the [[Scandinavian Peninsula]], including much of the northern parts of the [[Baltic Sea]], the higher mountains of Scandinavia and the areas close to the [[Arctic Sea]] in Russia. It has also bred sporadically in northern [[Scotland]].<ref name=BWP/> These birds spend the winters in the [[British Isles]], western Norway, the southern tip of Sweden, the coast from [[Brittany]] to Poland, including all of Denmark, the Alps, the eastern [[Adriatic Sea]], the northern and western Black sea and the southwestern Caspian Sea.<ref name=Ullman1992/><ref name=Delin2001/>

In North America, the greater scaup summers in [[Newfoundland and Labrador]], [[Ungava Bay]], [[Hudson Bay]], [[Lake Winnipeg]], northern [[Yukon]], northern [[Manitoba]], and northern [[Saskatchewan]]. It winters along the coasts of North America from northern [[British Columbia]] south to the [[Baja Peninsula]] and from [[Nova Scotia]] and [[New Brunswick]] south to [[Florida]], as well as the shores of the Great Lakes and the Gulf of Mexico.<ref name=EuropeBirdguide/>