Assertion: dolphin | /r/CapableOf | use their signature whistles
Facets:
value: for life
type: PURPOSE
value: to call out to one another
type: PURPOSE
Source sentences:
text: Dolphins use their signature whistles to call out to one another and may be able to remember other dolphins' whistles after decades apart.
text: Scientists believe that dolphins use these signature whistles for life, and female dolphins may even teach their calves their whistles before they're born.