crows picking up cigarettes trained to clean cigarette butts in Sweden 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%. Wild crows trained to pick up cigarette butts in Swedish street cleaning project South China Morning Post Clever Crows Pick up Cigarette Butts in Sweden in Exchange for Rewards This start up is 'RECRUITING' crows to pick up cigarette butts YouTube Butts for nuts: can crows do our dirty work (and should they)? Crows Trained to Pick Up Cigarette Butts by Swedish Startup

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