Goldeneye
Bucephala clangula
Orshúileach

The Goldeneye is a widespread but thinly distributed winter visitor from northern Europe. The plumage of the male is striking, with predominantly white body and contrasting glossy black head, with a white spot near the base of the bill. The female is dull brownish with a pale neck band. In flight, the Goldeneye is particularly noticeable due to the large white wing patches and the curious ringing noise made by the wings.

Information extracted from the Appletree Press title
Appletree Deluxe Editions: Ireland's Flora & Fauna - Birds
by Gordon D'Arcy.