Assertion: porpoise's fin | /r/CapableOf | give stability
Facets:
value: within the water
type: LOCATION
Source sentences:
text: The dorsal fin of a dolphin (located on the back of the dolphin) acts as a keel when the animal swims, giving the animal directional control and stability within the water.
text: The dorial fin gives stability to the dolphin while swimming.