sweden crows cigarettes A machine that trades food for litter : r/Amazing Crows trained to clean up

Crows trained to clean up cigarette butts in Sweden YouTube Crows trained to clean up cigarette butts in Sweden Reuters Crows trained to pick up cigarette butts in Sweden Unbox Sweden has begun training wild crows to collect litter especially cigarette butts in exchange for food rewards. A special machine recognizes when a crow drops a piece of 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

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