The term 'Bear Lair' refers to the DEN, CAVE, or HIDEOUT of a bear. A DEN is a small shelter or hiding place, usually underground, where a bear can sleep and hibernate. A CAVE is a large, naturally-formed opening in the ground or in a cliff face, often used by bears as a shelter. A HIDEOUT is a secret or secluded place where a bear can go to escape danger or be undisturbed. All three terms refer to the same type of place, but with different levels of size and security.