About: http://webisa.webdatacommons.org/110092801

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	They vary the sound a lot, though studies indicate that it is mostly through changing the opening of their mouths rather than through changing the positions of their tongues all that much.
http://www.w3.org/ns/prov#wasQuotedFrom	theweek.com