High Quality Content by WIKIPEDIA articles! The Rock Ptarmigan (Lagopus muta) is a medium-sized gamebird in the grouse family. It is known simply as Ptarmigan in Europe and colloquially as Snow Chicken or Partridge in North America, where it is the official bird for the territory of Nunavut, Canada, and the official game bird for the province of Newfoundland and Labrador, Canada.