why do city birds bring cigarette butts to their nests are using for pest control. 🚬 House sparrows and finches line with smoked filters. The nicotine left behind repels parasites like mites and lice. It's a Birds found a healthy use

Birds found a healthy use for cigarettes New York Post Urban birds use cigarette butts in their nests: the significance of this scientific finding in Mexico City Noticias Ambientales City birds use cigarette butts to fight nest parasites: City birds are using cigarette butts in their nests to reduce parasites, but the toxic tradeoff may come with hidden risks for chicks. # City birds keep surprising us, and this habit is one of the strangest yet. Some species now tuck used cigarette butts into their nests, and the reason may be brutally practical. According Birds use cigarette butts to line nests, St Andrews University study finds BBC News

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