sweden crow cigarette Crows trained to clean up butts on Swedish streets In Sweden, a startup tested

In Sweden, a startup tested a machine that rewards crows with food every time they drop cigarette butts into it. The idea sounds unbelievable, but the goal was simple: turn one of In Sweden They Train Birds to Remove Cigarette Butts! YouTube Crows trained to clean up cigarette butts in Sweden Reuters In Sweden, a startup tested a smart but unusual idea: rewarding wild crows with food for picking up cigarette butts. The birds drop the waste into a special machine and receive a

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