One day, a gull flew into Kelly’s pool, and she grabbed it and waited for the trainers. The humans seemed to really like birds; they traded her several fish for it. This gave Kelly a new insight, and a plan. During her next meal, she took the last fish and hid it. When the humans left, she brought the fish up and baited more gulls, to get even more fish. After all, why wait to scrounge an occasional piece of accidental paper when you could become a wealthy commercial bird-fishing dolphin? She taught this to her youngster, who taught other youngsters, and so the dolphins there became professional gull baiters.