do birds eat cigarettes use cigarette butts for chemical warfare against parasites. The nicotine and other chemicals in discarded filters act as a natural pesticide that repels parasitic mites. This is why birds are keeping City birds are using cigarette

City birds are using cigarette butts for pest control. House sparrows and finches line their nests with smoked filters. The nicotine left behind repels parasites like mites and lice. It's a That cigarette butt you flicked? It's in a bird nest now. , THE BEHAVIOR:, Birds gather soft materials for nests., Cigarette filters look perfect fluffy, light, everywhere., THE POISON:, Filters The tweet smell of birds nests: Scientists find birds feather their homes with the butts of cigarettes World of Birds 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 Bird feeding chick cigarette end captured in picture

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