Mergus serrator

- Plumage: Male features a dark glossy green head, broad white neck collar, cinnamon-red breast mottled black, black back, white sides with fine black barring. - Beak: Long, narrow, bright coral-red bill with serrated edges ("sawbill") and a hooked dark tip. - Body build: Slender, low-slung diving duck adapted for fast underwater pursuit of small fish. - Distinctive details: Shaggy double-pointed crest at back of head, vivid red irises, intense orange-red webbed feet.

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