Variability in the proportion of macronutrients in population diets is summarized in the variance matrix containing the pairwise log‐ratio variances (Table 2). Values close to zero indicate that the macronutrients in the ratio are highly proportional/codependent (i.e., relatively more constant). Protein and lipid in bear diets have log‐ratio variance closest to zero, implying that there is a higher proportional relationship between the consumption of the two macronutrients. Conversely, the highest log‐ratio variances occur with carbohydrate, which indicates that carbohydrate in bear diets is the least codependent on the other macronutrients. Following the 68‐95‐99.7 rule, ca. 95% and 99% of values are predicted to lie within 2 and 3 standard deviations of the mean; thus, the 2‐sigma and 3‐sigma regions in Figure 1 can serve as an estimate of the fundamental macronutrient niche of brown bears.