NPR reports that Joshua Klein has trained crows to retrieve spare change and drop it off at a receptical in exchange for a peanut.
Apparently Josh (J-Dogg I call him) found crows to be the fastest to adapt to this system, figuring it out almost immediately. Here’s a quick 1 min talk J-Money gave on the crows:
oh god please give me the blueprints for this hahaha it’s great!