why do city birds bring cigarette butts to their nests & City birds use cigarette butts

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. # Why do these birds build their nests with cigarette butts? Animal Behaviour Earth Touch News City birds are using cigarette butts for pest control. House sparrows and finches line their nests with smoked filters. The nicotine left behind repels parasites like mites and lice. It's a Birds are developing a 'cigarette habit': Scientists reveal the surprising reason The Times of India

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