Bucephala clangula

- Plumage: Breeding male has a dark iridescent bottle-green head appearing black, glossy black back, and crisp white neck, breast, and belly. - Beak: Short, triangular dark slate-black bill, deep at the base. - Body build: Medium-sized diving duck with a distinctive high-crowned, triangular head shape and stout body build. - Distinctive details: Striking intense golden-yellow eyes, sharp oval white cheek patch located between the bill base and eye.

This species is an important part of the ecosystems in Västerbotten.