Assertion: porcupine | /r/CapableOf | give birth
Facets:
value: in dens
type: LOCATION
value: once per year
type: TEMPORAL
Source sentences:
text: Hedgehogs only give birth once per year after a gestation of four to six weeks.
text: Porcupines sleep and give birth in dens made in rock crevices, hollow logs, or under buildings.