why do city birds bring cigarette butts to their nests and the City birds use cigarette buds

City birds use cigarette buds in their nests as pesticides?, Sources:, 1) Urban blue tit nests and cigarette butts: accidental litter or adaptive behaviour? (Animal Behavior), 2) Incorporation of Birds use cigarette butts to line nests, St Andrews University study finds BBC News Why do these birds build their nests with cigarette butts? Animal Behaviour Earth Touch News Disturbing Photo Shows a Black Skimmer Feeding a Cigarette Butt to Its Chick Audubon The Great Nest Defence: Why Urban Birds Are Building Homes With Cigarette Butts (And It's Working!) Times Now

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