Assertion: kitten | /r/CapableOf | become mature
Facets:
value: sexually
type: MANNER
value: around the age of one year
type: TEMPORAL
Source sentences:
text: At about 5 months old, kittens become sexually mature and can go into heat and multiply.
text: In spring, the female gives birth to two to three kittens, which become sexually mature around the age of one year.