why do city birds bring cigarette butts to their nests these build with butts? | Animal Behaviour City birds keep surprising us,

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 Butts for birds New Zealand Geographic 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. # Birds use cigarette butts for chemical warfare against ticks New Scientist Birds are developing a 'cigarette habit': Scientists reveal the surprising reason The Times of India

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