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
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... AND the dolphins started teaching each other to do the same! I have goosebumps now
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Julia we should probably not eat dolphins