Assertion: dolphin | /r/HasAspect | a signature whistle
Facets:
Source sentences:
text: Each dolphin has a signature whistle with which it identifies itself; a calf soon learns to recognize its mother's whistle.
text: Each dolphin has a signature whistle with which it identifies itself; a calf soon learns to recognize its mother's whistle.
text: Each dolphin has a signature whistle with which it identifies itself; a calf soon learns to recognize its mother's whistle.
text: Each dolphin tends to have a signature whistle to identify themselves to the other members.