Mackenzie Valley wolves inhabit much of western Canada and Alaska including Unimak Island. In 1995-96, they were brought from Canada to restore populations in Yellowstone National Park and central Idaho. In Alaska, wolf packs are usually 6 to 12 wolves, though some packs may be as large as 20 to 30. Their territories in Alaska average about 600 square miles. In Yellowstone, pack size averages 9.2 wolves with average territory size of 348 square miles. In Idaho, pack size averages 11.1 with territories averaging 364 square miles.