Fig. 1.

Details of sex, body mass, fat score and keel score for 136 adult birds samples from December 2014 to December 2016. In adult, 73 males and 63 females were observed, and 14 males and 14 females in the “Arriving” period, 37 males and 26 females in the “Staying” period, and 22 males and 23 females in the “Flying away” period were captured during the 2 years. The left panel summarizes body mass (g), the middle panel summarizes fat scores, and the right panel summarizes keel scores. The vertical lines indicate the standard deviation. Points with the same letter were significantly different (P<0.05). Both sexes showed significantly lower body masses in the “Flying away” period than in other periods. In both sexes, the muscle score changed significantly between “Arriving” and “Staying” and between “Staying” and “Flying away.” On the other hand, in females, the fat score was significantly decreased from “Staying” to “Flying away”.