Fig. 3

Annual variation in body temperature and heart rate (HR) across size groups; A The analysed daily mean body temperature data of brown bears in Sweden measured between 2010 and 2016 pooled in to three body mass groups: Small” (orange) was defined as < 60 kg (N = 25), “medium” (blue) as 60–120 kg (N = 11), and “large” (black) as 120–240 kg (N = 10). B Mean daytime HR of brown bears in Sweden measured between 2011 and 2016, pooled in to three body mass groups: “Small” (orange) < 60 kg (N = 32), “medium” (blue) 60–120 kg (N = 31), and “large” (black) 120–240 kg (N = 11). To illustrate the full annual cycle, the same data is partly shown twice (February to June). Sample sizes are for an individual in a given year, body mass measured in either February, May or June