Assertion: fox's pup | /r/HasProperty | born in den
Facets:
value: in march
type: TEMPORAL
value: usually
type: TEMPORAL
value: in april
type: TEMPORAL
Source sentences:
text: Throughout most of its range, the mating season starts in autumn (usually October–November) and after a gestation period around 50–60 days, two to four pups are born in a den.
text: Pups are usually born in a den in March or April, nearly hairless, blind and helpless.