https://youtu.be/TklOxbWfRDM?si=43PC59nC8B1s8SYS
Update: Sad to report that this experiment is probably false, according to Snopes. https://www.snopes.com/fact-check/sweden-crows-cigarette-butts/
Crows are being recruited to pick up discarded cigarette butts from the streets and squares of a Swedish city as part of a cost-cutting drive. The wild birds carry out the task as they receive a little food for every butt that they deposit in a bespoke machine...[The town currently] spends 20m Swedish kronor (£1.6m) on street cleaning...He estimates his method could save at least 75% of costs involved with picking up cigarette butts in the city. https://www.theguardian.com/environment/2022/feb/01/swedish-crows-pick-up-cigarette-butts-litter
France is trying it too.
https://youtu.be/zk644QrklNE?si=EGQCX3e0HjYVVwse
Cigarette filters contain cellulose acetate, a plastic. Although it disintegrates within a few months, the chemicals that leach out to them are " acutely toxic to freshwater invertebrates, even at 1 butt per liter. ref
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