Assertion: wolf's area | /r/HasProperty | den
Facets:
Source sentences:
text: not all these areas are dens (actually, they rarely are!).
text: They scout an area (either a den, cave, or open space) suitable for sleep, and when they have found one just right for the size of the pack and offspring, they settle for the days to come--however, wolves rarely stay in one place for a long period of time, so each sleeping territory is temporary!