Fig. 1
From: Wild common crossbills produce redder body feathers when their wings are clipped
Mean ± S.E.M body mass change (%) from the initial capture to recapture in adult male common crossbills used as controls or manipulated to increase their flying effort by clipping two primary feathers (i.e. third and fifth) of each wing (final body mass: 38.0 ± 0.50 g and 37.8 ± 0.49 g, respectively, for the 20 control and 14 clipped birds recaptured)