Fig. 1
Effects of huddling and cold on metabolic phenotypes. a–d Body weight gain, energy intake (n = 6–8/group), resting metabolic rate (RMR), and nonshivering thermogenesis (NST) (n = 7–9/group) in huddling and separated Brandt’s voles at warm and cold air temperatures (Ta). *P < 0.05, **P < 0.01, and *** P < 0.001