After a wolf is ready to mate, it will leave the pack, find a mate, and make a pack with some other unmarried, or married wolves and they will make a pack together. Wolves can live almost anywhere. They can live in the North or South, Tundra or Tree line, and even in mountains or around swamps. Whatever environment wolves are living in, they will live in a den. A den is a place in a hill, or in rocks where a wolf will live with its pack.
Wolves make the dens by digging with their paws.
They have a winter den, which is very warm, and a summer den. As mentioned earlier, there is a small den that the pups spend their first few weeks of life in with their mother. This den is not shared by the rest of the pack, who by that time are in their summer den. In their dens, wolves sleep, sometimes even eat or play, though most of the eating is done where the animal was caught. The Arctic wolf lives on the Tundra.