gt, "Dutch startup teaches crows to exchange cigarettes for food"

xxx: It is then necessary to develop the design of “legal” urns for smokers, inaccessible to the crows. Otherwise, they will quickly report to extract cigarettes from where their concentration is higher than accidentally abandoned on the street.
Yyy: Wouldn’t it be easier to teach people to exchange cigarettes for something useful, such as an Orbit gum, using the same principle and device?
zzz: It seems that the crowns are easier to train.