Fig. 2. Body mass (g; top) and feeding duration (s; bottom) of one bird (individual 7) feeding on the 10% w/w sucrose diet. The x-axis shows a time period of 70 min during the morning of the experimental day. The bird steadily lost body mass as a result of evaporation and excretions, and feeding events led to increases in body mass. Note that multiple overlapping symbols appear filled.