Assertion: dolphin | /r/HasAspect | whistle
Facets:
Source sentences:
text: Dolphins have a wide range of vocalizations, including whistles, grunts, trills, squeaks and moans that they use to communicate in order to hunt efficiently, raise young and guard against predators.
text: They have whistles that can be so loud that they can stun fish just by the sound waves they are able to produce.