Repost from juliagalef:
Aquarium rewards dolphins w/a fish if they bring a piece of litter or dead gull (to help keep pool clean)
One dolphin starts (1) tearing pieces of litter into smaller pieces & trading each piece in for a reward & (2) stockpiling fish to lure & kill gulls
https://www.theguardian.com/science/2003/jul/03/research.science
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