Average (±1 s.e.) (a) duckling growth. Filled circles, 37.0°C (n = 32); triangles, 35.9°C (n = 34); filled diamonds, 35.0°C (n = 29). and (b) body condition of wood ducks (Aix sponsa) that hatched from eggs incubated at different temperatures. White bars, 35.0°C (n = 28); black bars, 35.9°C (n = 34); light grey bars, 37.0°C (n = 35).