Assertion: black swan's range | /r/HasProperty | 0.6 to 1 mi
Facets:
Source sentences:
text: The most familiar sound associated with mute swan is the vibrant throbbing of the wings in flight which is unique to the species, and can be heard from a range of 1 to 2 km (0.6 to 1 mi), indicating its value as a contact sound between birds in flight.