Assertion: rat's litter | /r/HasProperty | born
Facets:
value: once or twice per year
type: TEMPORAL
Source sentences:
text: Estrus occurs again after a litter is born.
text: The gestation period lasts for 40 to 75 days when a litter of one to eight ‘kits or cubs’ are born.
text: Litters of one to eight well-developed young are born once or twice per year.
text: After usually 63 to 65 days of gestation (although anywhere from 54 to 70 days is possible), a litter of typically two to five young is born.