Assertion: gibbon's call | /r/HasProperty | duet
Facets:
value: usually
type: DEGREE
Source sentences:
text: The most characteristic vocalization is the “great call,” usually a duet in which the female leads and the male joins in with less-complex notes, used as a territorial marker by both sexes.
text: Each morning, the family gathers on the edge of its territory and begins a "great call", a duet between the breeding pair.
text: Each morning, the family gathers on the edge of its territory and begins a “great call”, a duet between the breeding pair.
text: these calls are duets—different but complementary calls made by the male and female.