https://www.nytimes.com/2026/03/18/science/bird-nests-cigarettes.html?unlocked_article_code=1.UFA.F5GS.0LI5710DsNRs&smid=url-share
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Darwin's finches in the Galápagos, house finches in Mexico and song thrushes in New Zealand have all developed a curious habit: They put cigarette butts in their nests. Some songbirds in Britain are even nesting in outdoor ashtrays..."
