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Mean mass (g), relaxed wing chord (mm), and tarsus length (mm ± SE) of experimentally (Low, 36.1°C; High 37.8°C) and naturally incubated American robin (Turdus migratorius) nestlings on days 7 and 10 during the nestling period of the 2015 and 2016 breeding seasons. Day 7: Low: n = 14; High: n = 23; Natural: n = 37; day 10: Low: n = 8; High: n = 18; Natural: n = 26. There was no significant effect of incubation treatment on mean mass, wing chord, or tarsus length at day 7 or day 10
