Smew

The smew is definitely one of the most striking ducks! Very nicely portraited/photographed I must say with the cool blue colors in the background.

This species breeds in the northern taiga of Europe and Asia. It needs trees for breeding. The Smew lives on fish-rich lakes and slow rivers. As a migrant it leaves its breeding areas and winters on sheltered coasts or inland lakes of the Baltic Sea, the Black Sea, northern Germany and the Low Countries, with small number reaching Great Britain, mostly at regular sites. On lakes it prefers areas around the edges, often under small trees.

The Smew (Mergellus albellus) is a small duck which is intermediate between the mergansers and the goldeneyes, and has interbred with the Common Goldeneye. It is the only member of the genus Mergellus (Selby, 1840). [source: youpet.com]

Thank you very much Daria!