Assertion: hummingbird's sound | /r/HasProperty | produced with outer tail-feathers
Facets:
value: a second, rather faint
type: OTHER
value: during the dive
type: TEMPORAL
value: sometimes
type: TEMPORAL
Source sentences:
text: A second, rather faint, repeated whining sound is sometimes produced with the outer tail-feathers during the dive, as the male flies over the female, spreading and shutting the tail as he does so.