* Abandoned burrows dug by other animals, like badgers or foxes.
* Caves formed by natural rock formations.
* Hollow logs or thickets of trees.
* Dense underbrush that provides cover and protection.
Wolves might also use temporary shelters like thickets or caves for short periods of time, especially during harsh weather conditions.
It's important to remember that wolves are highly adaptable animals and may use different types of shelter depending on the environment and the time of year.