Chemicals in tobacco leaves are known to repel arthropods such as parasitic mites, so Monserrat Suárez-Rodríguez […] and her colleagues wondered whether city birds were using cigarette butts in the same way.
They measured the amount of cellulose acetate (a component of cigarette butts) in the nests, and found that the more there was, the fewer parasitic mites the nest contained.
the team found that devices with unsmoked butts had many more parasites attached to them than devices with smoked butts — which contain more nicotine as the cigarette smoke has passed through them.
[City birds use cigarette butts to smoke out parasites sur]

Intéressant de voir comment, encore une fois, la nature a su s’adapter et tirer profit de l’activité humaine.