Assertion: dolphin's group | /r/CapableOf | impede their movement
Facets:
value: under the ice
type: LOCATION
Source sentences:
text: The groups near to or under the sea ice have a degree of protection, as the killer whale's large dorsal fin, up to 2 m in length, impedes their movement under the ice and does not allow them to get sufficiently close to the breathing holes in the ice.