Rock ptarmigan / Alpenschneehuhn (Lagopus muta)

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Classification: Genus Lagopus; Subfamily Grouses (Tetraoninae); Family Turkeys (Phasianidae)
This bird appears across the great seas in the following continents: Europe, North America.
Deutschland: Brut-, Jahresvogel RL R
Vocalization:

Female has similar sounds, but is higher pitched and not so coarse as male. [Link]
Calls:

Call of male a very distinct "rrrrrrr", being a rattling rapid pulse of clicks, like running a stick along a picket fence. [Link]
Physical details: length=34-36 cm, wingspan=54-60 cm, weight=350-600 g
Habitats: Mountain

🔍 No documented observation