Related story, about dolphins doing a similar trick... and gaming the system: > Kelly has taken this task one step further. When people drop paper into the wat

Related story, about dolphins doing a similar trick... and gaming the system: > Kelly has taken this task one step further. When people drop paper into the water she hides it under a rock at the bottom of the pool. The next time a trainer passes, she goes down to the rock and tears off a piece of paper to give to the trainer. After a fish reward, she goes back down, tears off another piece of paper, gets another fish, and so on. This behaviour is interesting because it shows that Kelly has a sense of the future and delays gratification. She has realised that a big piece of paper gets the same reward as a small piece and so delivers only small pieces to keep the extra food coming. She has, in effect, trained the humans. https://www.theguardian.com/science/2003/jul/03/research.science https://www.theguardian.com/science/2003/jul/03/research.sci...