Mastodawn

Crows are intelligent birds and learn quickly – even from each other.
In Sweden, they are used to collect cigarette butts and bring them to a machine that automatically rewards them with peanuts.

Here some links provides by users:
https://journals.sagepub.com/doi/10.1177/25166042241296275
and:
https://www.heise.de/news/Schwedisches-Start-up-hinter-Kippenstummel-sammelnden-Kraehen-meldet-Insolvenz-an-11094091.html

I did a quick bit of reading about this. A Dutch team tried similar and that project called Crowbar failed.

Nicotine is highly toxic, so there is that, alongside other ethical considerations.

None of which undermines the fact of corvid intelligence. I wonder if they are intelligent enough to go on strike?

@lionelb Oh they'll strike at you if they're mad. With beaks and claws and a dozen friends....