Which nocturnal animal lives in sett (underground tunnel)? How is it built?

The badger, a member of the weasel family, lives in sett. It uses its strong claws to build the tunnels of the sett in the side of a bank or among tree roots. Over the years more tunnels are added. A large sett may be 100 years old.

Nocturnal Animal, Sett, Badger, Weasel Family, Tree Roots