Assertion: whale's fin | /r/HasProperty | effective arms
Facets:
value: in confrontations with killer whales
type: TEMPORAL
Source sentences:
text: With a series of knuckle-like knobs, the humpback’s very long, powerful pectoral fins along its anterior edges are effective arms during confrontations with killer whales.
text: These very long heavy pectoral fins with a row of knuckle-like knobs along their anterior edges are effective weapons in confrontations with killer whales.