They are called lairs, dens, burrows or earths.
A den or a lair.
A fox lives in a lair, a den or a burrow - choose your terminology.
It may be called a den, a lair, a burrow or an earth.
The fox's home may be called a lair,a den or, simply, a burrow.
It may be called a den, a lair, a burrow or an earth depending on the local area.
A fox.
A foxe's den.
A fox digs a burrow called a lair or a den.
he is unnamed, as he is never called by name, and never appears before or after that episode.
The sly fox cunningly lured the rabbit into his lair.
Irma Lair is the name of the current water guardian in W.i.t.c.h.
Lair.