Assertion: bear's den | /r/HasProperty | cave
Facets:
value: in the ground
type: LOCATION
Source sentences:
text: Having put on enough weight, they enter their den, which can be a cave or hollow tree, where they spend the winter.
text: Their dens can either be dug-out hollow trees (60 feet above ground), caves or holes in the ground, hollow logs, or steep, mountainous and sunny slopes.