Training crows to pick up cigarette butts - GIF

Training crows to pick up cigarette butts.

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Previously:

Japanese hawks trained to attack crows that damage electrical infrastructure - GIF
Crow water displacement experiment - GIF

I offered to train a guy in the street to pickup his own cigarette but (he dropped it and was about to walk away) - my offered training method involved a cattle prod... for some reason he changed his behaviour pretty fast that time, but unsure if it was a permanent change