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Wild crows trade cigarette butts for peanuts to keep Swedish streets clean
27.51
In parts of Sweden, specially designed machines have been used to train crows to collect discarded cigarette butts and exchange them for food. The system works like a small vending machine: when
28.61
Crowbars: Vending Machines Reward Crows for Cleaning Up Cigarette Butts
25.71
Crows 'Paid' to Pick Up Cigarette Litter in Sweden
21.43
Swedish firm deploys crows to pick up cigarette butts | Birds
22.14
A Swedish company called Corvid Cleaning is training wild crows in the city of Södertälje to collect cigarette butts in exchange for food rewards. The project uses a specially designed machine that
20.48
Six crows were trained to collect the butts thrown on the ground in France. Crows throw the cigarette butts they collect on the street into a machine and buy food from the machine as a reward
21.19
