Figure 4

Relationship of metabolic rate and body mass in giant pandas and other bears. Metabolic rate includes field metabolic rate (FMR), resting metabolic rate (RMR), and active metabolic rate. The orange regression line for RMR of large mammals was calculated using the data in Table 3 and included the resting metabolic rates of 20 large mammals from Sieg et al.¹⁶ and average resting metabolic rates of grizzly bears and polar bears from Pagano et al.¹², sloth bears from McNab¹¹, and black bears from Toien¹⁰. It did not include the RMR of the giant panda. The regression equation is (RMR) = 106.41 (mass_kg) + 671.77 (r² = 0.524, p = 0.00), where y is RMR and x is body mass. The green dashed line is the regression line from Nagy et al.³⁹ (FMR = 4.82 (mass_g)^0.73). The blue regression line for FMR of large mammals included the FMR of 10 large mammals and active metabolic rates and FMR of bears from the Table 4. It did not include the FMR of giant pandas. The regression equation is (FMR) = 292.66 (mass_kg) + 585.35 (r² = 0.99, p = 0.00) where y is FMR and x is body mass.