There was the guy who trained his local magpies to collect discarded bottle caps... https://interestingengineering.com/innovation/magpies-trained-to-exchange-li

There was the guy who trained his local magpies to collect discarded bottle caps... https://interestingengineering.com/innovation/magpies-trained-to-exchange-litter-for-food-with-diy-bird-feeder https://interestingengineering.com/innovation/magpies-traine...