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They Set Traps And Plan Ahead
Once upon a time in Mississippi, dolphins were trained to collect trash and then exchange it for fish. Seems like a simple thing to do, right? Well, a dolphin named Kelly turned it up a notch. She collected pieces of paper, tore them into smaller pieces and exchanged all the small pieces so she could get more fish than the big piece would get her. This pretty much proves dolphins have the intelligence to leave the small reward now if that means a bigger reward later.
This same dolphin later caught a seagull in her tank and got a whole boatload of fish as a reward for that. She left the fish out in the open to draw in more seagulls, and even taught the seagull trap to her offspring.
