Fig. 4. Relationship between body mass and metabolism during the workload phase. Triangles represent resting metabolic rate (RMR), and circles represent daily energy expenditure (DEE). Body mass significantly predicted both DEE (solid line: F_1,16=26.3, P<0.0001, R²=0.62; y=2.25x–12.41) and RMR (dotted line: F_1,16=8.3, P=0.01, R²=0.34; y=0.80x+10.21) of mice faced with low foraging costs (black symbols), high foraging costs (open symbols), or food restriction without foraging (grey symbols). Sample sizes per group were L=7, H=6 and R=5.