Assertion: grouse's wing | /r/HasProperty | brought over the back
Facets:
value: to produce two sharp claps
type: PURPOSE
value: together
type: MANNER
Source sentences:
text: At the end of a short flight through the trees, the wings are brought together over the back so as to produce two sharp claps, about 0.5 s apart, loud enough to be heard by the human ear 150 m away.