The rock ptarmigan (lagopus muta) is part of the mountain galliformes (grouse, hazel-grouse). An artico-alpine species and champion of camouflage, it is particular for its almost white plumage in winter and grey brown in summer. This place replicates the characteristics of its original environment: the tundra. Vanoise National Park is one of the partners of the mountain galliformes observatory and the Plan du Lac area is a reference area for the monitoring of this species.