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Comparison of change in size (days 10–7) between each focal nestling (Low, 36.1°C, black bars; High, 37.8°C, dark gray bars) and their paired naturally incubated foster nest mate (paired with Low = white, paired with High = light gray, ±SE) in American robin (Turdus migratorius) nestlings during the 2015 and 2016 breeding seasons. Low: n = 8; High: n = 18
