National Geographic : 2006 Aug
Pacific white-sided dolphins circle a school of herring like a cyclone, pressing them into a ball near the surface and plucking from the edges. If the ball expands, the dolphins dart in or release rushes of bubbles to push the fish back into formation. Gulls and auklets dip into the fray, helping keep the ball intact. At one point the entire school engulfed me. I pulled back, mindful that vastly bigger herring fans-humpback whales-were nearby.