crows cleaning up cigarettes Clean City Streets by Collecting Cigarette Butts In Sweden, group of crows

In Sweden, group of crows are trained picking up cigarette butts off the street, cutting clean up costs by up to 75%. Sounds like a good deal to me The Swedish city of Sdertlje has trained crows to collect cigarette butts in exchange for food. The intelligent birds drop discarded cigarette ends into A machine that trades food for litter : r Amazing Butts for nuts: can crows do our dirty work (and should they)? No, crows aren't cleaning up cigarette butts in Sweden Popular Science

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