Related, for things that could be teared up: https://www.theguardian.com/science/2003/jul/03/research.science https://www.theguardian.com/science/2003/jul/03/re

Related, for things that could be teared up: https://www.theguardian.com/science/2003/jul/03/research.science https://www.theguardian.com/science/2003/jul/03/research.sci.... Apparently, a dolphin Kelly discovered the exchange rate to be one fish per one piece of paper... thus tearing a larger piece of paper into smaller parts, and getting a reward for each small piece. They 'gamed' the exchange rate into their advantage. > 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.