Assertion: hummingbird's sound | /r/CreatedBy | their wings
Facets:
value: in flight
type: TEMPORAL
Source sentences:
text: Hummingbirds are named after the humming sound which is produced by their wings during flight.
text: A moderate hum sound is also generated by the wings in flight but may not be heard unless the birds are very close.
text: Hummingbirds get their name from the humming sound produced by their wings as they fly.