Assertion: bulbul's plumage | /r/HasProperty | offset by bright colours
Facets:
value: frequently
type: TEMPORAL
value: on the bill
type: LOCATION
Source sentences:
text: The plumage of hornbills is typically black, grey, white, or brown, and is frequently offset by bright colours on the bill, or by patches of bare coloured skin on the face or wattles.