Assertion: porcupine | /r/AtLocation | den
Facets:
value: during winter storms
type: TEMPORAL
value: on the ground
type: LOCATION
Source sentences:
text: A porcupine lives in a den.
text: Porcupines in the Rocky Mountains feed primarily on ponderosa pines, and rest in dens on the ground.
text: During winter storms the porcupine may stay in its den.
text: One winter the porcupine staying in that den died, but every year since, a porcupine has moved in to spend part of the winter.
text: Generally, porcupines are solitary in the summer and colonial in winter, living in dens found in hollow trees or natural caves in rocks.