Assertion: lemur | /r/CapableOf | become frustrated
Facets:
value: often
type: TEMPORAL
Source sentences:
text: but their isolation when they’re taken to live as pets means the lemurs often become frustrated and aggressive, particularly when they reach sexual maturity at about 3 years old, says Marni LaFleur, an adjunct professor at the University of California–San Diego and co-director of Lemur Love.