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 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 line nests with cigarettes PEST UK Cigarette Butts in Birds' Nests May Deter Parasites World of Birds Why Urban Birds Are Adding Cigarette Butts to Their Nests Why Urban Birds Are Adding Cigarette Butts to Their Nests One Green Planet

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