About: http://webisa.webdatacommons.org/52897261

Property	Value
http://www.w3.org/1999/02/22-rdf-syntax-ns#type	http://www.w3.org/ns/prov#Entity
http://www.w3.org/ns/prov#value	The reflected calls had an oscillating pitch, like a wailing siren, whereas stationary objects including leaves and branches produced single-toned echoes.
http://www.w3.org/ns/prov#wasQuotedFrom	bbc.co.uk