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Birds use cigarette butts for chemical warfare against ticks New Scientist 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 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 Why Some Birds Seem to Be Developing a Cigarette Habit The New York Times

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