There are three rare mammals who live in this zone. The wolverine inhabits a vast territory, roaming as far as the coniferous forests in winter, but the alpine zone is their main territory. They mostly eat carrion, but they do also hunt living animals such as small rodents, birds and insects. The wolverine is labelled as an endangered species in Sweden with an estimate of 360 individuals in the country in 2000. The Arctic fox is a critically endangered species in Sweden, with only 50 individuals in the whole country. They dig extensive networks of tunnels in areas above the tree-line, with several families inhabiting the same sett. The park is one of the last sanctuaries for the gray wolf, a species also critically endangered in Sweden. In 1974–1975, the park was home to the only remaining wild wolf living in Sweden. Although the wolf population is now growing, they have not yet achieved a stable number in the park.