Assertion: hummingbird's sound | /r/CreatedBy | their beating wings
Facets:
value: rapidly
type: MANNER
Source sentences:
text: They are known as hummingbirds because of the humming sound created by their beating wings, which flap at high frequencies audible to humans.
text: They are known as hummingbirds because of the humming sound created by their beating wings which flap at high frequencies audible to humans.
text: They are called hummingbirds due to the sound created by their rapidly beating wings.