The Tufted Duck is native to most of northern Eurasia. This page shows the drake with his head tuft which gives the species name; females and young are on a separate page.
His black head has a green or purple sheen depending on the angle and light.
Another bad hair day
Tufted Duck in flight
Male or female? Slight greenish tinge to head indicates former.
The drake's eclipse plumage is similar to the female
Truncated tuft and amber eye (or is the latter just the light?)
Strange bill, tuft and colouring