Seasonally, many diets were close to the 17% isoportion line during autumn (Figure 4). The 99% confidence region around the autumn geometric mean proportion included the 17% protein isoportion line, which suggests they are not significantly different at that level. Both spring and summer diets were generally higher than 17% protein. Of the three winter diets reported, two were near the 17% line, while one was noticeably lower (not shown). During autumn, mean diets of both anthropogenic and natural diets had confidence intervals including the intake target region of captive bears (Figure 5); however, diets receiving anthropogenic subsidies made up the majority of autumn diets near to the intake target.