why do city birds bring cigarette butts to their nests use protect babies Most people think this bird

Most people think this bird is addicted. Reality is darker. It's using cigarette butts to protect its babies. Urban birds like sparrows are weaving cigarette filters into their nests. Why? Nicotine kills 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 are developing a 'cigarette habit': Scientists reveal the surprising reason The Times of India Marlboro palace: how city birds feather their nests The Independent The Independent Butts for birds New Zealand Geographic Birds use cigarette butts for chemical warfare against ticks New Scientist

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