For example, when feeding, a humpback may swim in upward spiraling circles beneath a prospective meal of crustaceans or fish, all the while blowing a stream of bubbles. This bubble net, as small as five feet [1.5 m] in diameter, corrals the creatures at the surface.
Piemēram, kad kuprvalis barojas, tas mēdz celties ūdenī uz augšu zem maltītei nolūkotā vēžveidīgo vai sīku zivju bara, spirāliski mezdams apļus un nepārtraukti izlaizdams burbuļu straumi.