Crows trained to clean cigarette butts from city streets
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With more than four trillion cigarette butts discarded each year, cities in every country struggle to deal with the problem. Some scientists think that the intelligence of crows is near to that of monkeys and apes, and now, Netherlands-based Crowded Cities is training crows to pick up the trash. Crowded Cities’ Crowbar is a small trash can that rewards the birds with food every time they drop in a littered cigarette butt. The tiny size of cigarette butts make them difficult for human cleaning teams to successfully tackle, and the plastics inside the filters may take up to ten years…
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