Assertion: grouse's feather | /r/HasProperty | revealed
Facets:
value: briefly
type: MANNER
Source sentences:
text: Unlike the male Eurasian black grouse, the Caucasian grouse display is almost mute but for a thin whistling of the cock fluttering his wings as he leaps and turns in the air, producing a flash of white as the underwing feathers are briefly revealed.