why do city birds bring cigarette butts to their nests use buds in nests... as pesticides?, Sources:, 1) Urban blue tit and cigarette butts: accidental litter or adaptive behaviour? (Animal Behavior), 2) Incorporation of 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 Why is a bird picking up cigarette butts?, Not addiction. Survival., Some city birds use cigarette filters in their nests because nicotine kills parasites., This behavior is called Why Some Birds Seem to Be Developing a Cigarette Habit The New York Times City birds use cigarette butts to ward off ticks CBC Radio To protect their nests from parasitic mites, urban birds line their nests with used cigarette butts. The use of nicotine as a pesticide is natural. Birds Putting Cigarette Butts to Good Use

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