Then the crows will learn to distribute free cigarettes hoping people will pick up smoking and throw empty butts on the street.
See the Cobra effect: https://en.m.wikipedia.org/wiki/Perverse_incentive
See the Cobra effect: https://en.m.wikipedia.org/wiki/Perverse_incentive
Example of dolphins doing the first trick:
>> Kelly [the dolphin] 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.
https://www.theguardian.com/science/2003/jul/03/research.sci...