Assertion: dolphin's whistle | /r/HasProperty | distinctive
Facets:
Source sentences:
text: Bottlenose Dolphins communicate with each other using body language and distinctive whistles, clicks and sounds produced by six air sacs near their blow hole (they lack vocal cords).
text: Scientists believe that every bottlenose dolphin develops a distinctive high-pitched whistle, called a signature whistle (Tyack, 2000).