Assertion: bear's mother | /r/CapableOf | hibernate in den
Facets:
Source sentences:
text: By this time the mother is on her own again and hibernating in a den.
text: This process, called “Delayed Implantation” allows her to time the birth of the cubs when it is right, usually matching the birth with the time the mother is hibernating in a cave or den.
text: The cubs are born from November through January while their mothers are hibernating in a den.