Cheating Chickadees Are Seduced by Smarts | Female mountain chickadees are loyal to their mates, unless a smarter suitor comes along.

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https://www.nytimes.com/2026/07/01/science/cheating-chickadees-are-seduced-by-smarts.html?unlocked_article_code=1.uVA._6bg.4AUEhO2hcfm_