Data from: An experimental demonstration that house finches add cigarette butts in response to ectoparasites

Monserrat Suárez-Rodríguez & Constantino Macías Garcia
Urban species encounter resources that are uncommon in nature, such as materials found in city waste. Many studies have shown that these can be harmful to wildlife. In Mexico City, house finches bring cigarette butts to their nests, which reduces the amount of ectoparasites, but also induces genotoxic damage in chicks and parents. Yet, the reason for this behaviour is unknown. One possibility is that birds extract the cellulose fibres from discarded butts simply because...
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