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Crows trained to clean up cigarette butts on Swedish streets National Swedens Genius Experiment: Crows Trained to Clean Up Cigarette Butts?! Wild crows trained to pick up cigarette butts in Swedish street cleaning project A Swedish company has been training crows to pick up cigarette butts in an effort to reduce the cost of cleaning litter off the streets in Sdertlje, near Stockholm., Corvid Cleaning has developed a Butts for nuts: can crows do our dirty work (and should they)? Clever Crows Are Now Picking Up Cigarette Butts And Quietly Saving Millions in Cleaning Costs

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