crows cigarette butts A project in Sweden is training to help clean the streets by collecting discarded butts. The system uses a machine that rewards the birds with food when they drop cigarette Crows trained to clean up
Crows trained to clean up cigarette butts on Swedish streets National Crows to help clean up cigarette butts in Sweden This start up is 'RECRUITING' crows to pick up cigarette butts YouTube Crows help to clean up cigarette butts in several countries Sweden uses crows to pick up cigarette butts
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