Biddable Binners

Rooks “will be encouraged to spruce up the park through the use of a small box that delivers a nugget of bird food each time the rook deposits a cigarette end or small piece of rubbish.” https://www.theguardian.com/world/2018/aug/11/rook-at-this-mess-french-park-trains-crows-to-pick-up-litter

We could simplify the process by rationing litterers’ food, and only issue them with pellets in return for tidying.

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