Lagopus muta

- Plumage: Pure white in winter with black outer tail feathers; summer male grayish-brown fine mottling; summer female warm yellow-brown barred. - Beak: Short, stout, sharp black bill. - Body build: Medium-sized plump grouselike body adapted for extreme high-altitude alpine climates. - Distinctive details: Distinct black stripe running from bill through eye to lore in winter males (absent in females), dense feathers covering feet down to claws.

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