Assertion: cetacean | /r/CapableOf | expose pectoral fins
Facets:
value: into the air
type: TRANSITIVE-OBJECT
Source sentences:
text: Pectoral slapping, informally known as pec-slapping, is when a cetacean turns on its side, exposes one or both pectoral fins into the air, and then slaps them against the surface of the water.