|Irish Name:||Lacha iascán|
|Scientific name:||Anas marila|
Winter visitor, from Iceland, northern Europe and western Siberia, mostly occurring between November and April.
Medium-sized. Males with black head and neck, with white wing bar, are similar to Tufted Duck but distinguished by the lack of a crest, and more elongated shape. Bill pale grey. Females dull brown with pale grey-brown flanks and slightly darker back. A broad white band surrounds the base of grey bill.
Chorus of low whistles during display, and males otherwise relatively silent. Females drawn out raucous 'krrah krrah krrah'.
Their diet in winter consists largely of animal matter, principally crustaceans and molluscs.
Does not breed in Ireland. The breeding range includes Greenland, Iceland, northern Scandinavia and Siberia, as well as North America. Scaup nest beside shallow tundra pools and lakes.
Scaup occur mostly in small parties and occasionally larger flocks around coastal estuaries and bays, on brackish lagoons and in shallow marine waters, usually less than 10 m in depth.
Widespread around coastal loughs and bays in Winter. Loughs Neagh & Beg in County Antrim by far the most important, supporting almost 4,000 birds. Tralee Bay, Lough Gill & Akeragh Lough in County Kerry, Carlingford Lough in County Down, Wexford Harbour & Slobs in County Wexford and Belfast Lough in County Antrim are other important wintering sites (200-900 birds).
Breeds mainly in Northern Europe.