▫ Corvid Cleaning, a company outside Stockholm, Sweden, is teaching wild crows for a trial project to clean up cigarette butts from the streets of Södertälje.
▫ The crows have been taught to dump cigarette butts into a vending machine in exchange for food.
▫ The vending machine gives out the reward after it scans to confirm that the placed item is a cigarette butt and not leaves or other garbage.