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Cigarette Butts in Nests Deter Bird Parasites - awesome post by +Hannah Waters at +Scientific American Blogs

The sight of cigarette butts delicately woven into birds’ nests sparks an array of reactions, from relief that birds are adapting to urban environments to disgust at the display of human disregard for wildlife. But a new study suggests that some birds may benefit from nesting with cigarette butts. The nicotine lingering in filters may serve as an insecticide, driving parasites away from the nests and the baby birds living within.
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