crows picking up cigarettes trained to clean cigarette butts in Sweden Wild crows trained to pick

Wild crows trained to pick up cigarette butts in Swedish street cleaning project South China Morning Post Sweden deploys 'easy to teach' CROWS to pick up cigarette butts on city streets Daily Mail Online A Swedish startup, Corvid Cleaning, is tackling litter by training wild crows to collect cigarette butts in exchange for food : r interesting Butts for nuts: can crows do our dirty work (and should they)? Sweden startup is teaching crows to clean up cigarette butts after stupid humans

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