Which Alpine animals develop white winter coats?

In the Alpine region, the mountain hare and the ptarmigan are notable animals that develop white coats or plumage during the winter months.1

This seasonal change serves as a form of camouflage, allowing these species to blend into the snowy environment of the high-altitude landscape. While other Alpine animals, such as the ibex and chamois, are well-adapted to the craggy terrain, they do not undergo this specific winter whitening process.213