Assertion: manta ray | /r/CapableOf | give birth to twin
Facets:
value: occasionally
type: DEGREE
Source sentences:
text: After a gestation period of twelve to thirteen months, the female manta rays give birth to a single pup (although occasionally they may also give birth to twins), which measures roughly 1.5 meters (5 feet) across from wing-tip to wing-tip at birth.