Assertion: humpback whale's mother | /r/CapableOf | use their voices
Facets:
value: to maintain contact
type: PURPOSE
Source sentences:
text: It's more likely that calves and mothers use their voices to maintain contact, and the quiet calls kept them from being "overheard" by opportunistic predators or interested male humpbacks, said the study's lead author, Simone Videsen, a researcher with the Department of Bioscience at the Aarhus University in Denmark.