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Average length of incubation period (days; ±SE) for naturally incubated American robin (Turdus migratorius) eggs, and two experimental treatments: Low (36.1°C) and High (37.8°C) during the 2015 and 2016 breeding seasons. Natural: n = 265; Low: n = 65; High: n = 61. Asterisk denotes statistical significance (p ≤ .05)
