Kelly, the Gull-Baiting Dolphin
Action for Dolphins, Tiny Fox Lab

Kelly, a dolphin whose trainers gave her fish for bringing them litter/dead gulls to clean her pool. She started hiding fish under a rock in her pool, then used fish to lure gulls which she brought to her trainers to get more fish. She taught her calf the strategy, who taught more calves.Tiny Fox Lab Facts

Preview photo credit: Action for Dolphins