Assertion: mountain gorilla's back | /r/HasProperty | mature
Facets:
value: sexually
type: MANNER
Source sentences:
text: From this position, there follows the one (1) or two (2) black backs that act as watchmen, three (3) or four (4) that are sexually mature and more bonded to the main silverback for life and these are followed by a range of Juveniles ranging from three (3) to six (6) and the infants.