"Read me" for usage of Data_Changes in foraging mode Each sheet contains the data presented in each figure and table of the article. All the mitochondrial measurements were performed at 20°C. Missing values of the mitochondrial measurements at the fibre or at the muscle level (Figure 2 ; Table 2) have been retired when the measurement was more than 2 standard deviations higher than the group average, or when the oxygen consumption after the addition of cytochrome c was increased by 30% or more. Missing values of the mitochondrial measurements at the mitochondrial level (Table 2) are due to omissions during the measurements. In the tab "Figure 3", the missing values are due to omissions during the measurements. Specific legends : NA = missing values. Identity refers to the fisg tag. LI = large items, SI = small items, LQ = large quantity, SQ = small quantity. BCI = Body condition index ETS = electron transport system ATP/O ratio = ratio between ATP production rate and oxygen consumption rate