Fig. 1. Foraging time, activity and body mass in relation to chaff/seed ratio. (A) Proportion of time spent foraging between 09:00 h and 10:30 h increased with chaff/seed ratio (F_1,77=22.0, P<0.001), decreased with body mass (F_1,80=8.81, P<0.005) and with the interaction between temperature and chaff/seed ratio (F_1,71=16.2, P<0.001; temperature: F_1,70=0.5, P=0.5). The plotted data are not corrected for body mass. (B) Time spent on activities (including foraging) during the observation period was related to temperature (F_1,84=39.2, P<0.001) and chaff/seed ratio (F_1,84=5.29, P=0.024). (C) Body mass was independent of chaff/seed ratio (GLMM: F_1,169=2.23, P=0.14, including individual as random effect).