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Temporal trends in mean ± SE short-axis flight muscle width measured by ultrasound as a function of Accl temperature in winter (Win) and summer (Sum) house sparrows from South Dakota, USA. Pre-Accl measurements occurred the day prior to Accl and post-Accl measurements occurred after the full 6-week Accl period. Significant differences between pre- and post-Accl periods are denoted by an asterisk.
