Question: Bubble-net feeding is a unique and complex feeding behavior engaged in by what animal, that has a distinctive body shape, with long pectoral fins and a knobbly head?
Sentence (from "Prionotus evolans"): There is only one dark bar crossing the pectoral fin and usually it is so diffuse as to be a mere darkening of the center of the fin rather than a definite pattern.
Relevant evidence: No