Dolphins are smart...very smart

[N]ot only has Kelly the dolphin been trained to keep her pool clean, she's also figured out that a big piece of trash gets the same reward as a small piece of trash. Naturally, she's learned to deliver only small pieces of waste to her trainers in order to keep the snacks coming. Moreover, she's discovered that by saving some of her fish-treats, she can lure gulls to her tank, catch them, and receive even more fish from her trainers. She's taught this trick to several of her pool-mates, as well, and now they're all doing it.