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 While birds use trash to build their nests, it can harm them World Economic Forum City birds use cigarette butts to ward off ticks CBC Radio 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 Birds Putting Cigarette Butts to Good Use Birds use cigarette butts for chemical warfare against ticks New Scientist

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