The effect of log body mass on mass-specific DEE (a) and RMR (b). an = 130, log mass-specific DEE = 2.38 − 0.342 log body mass, r2 = 0.756, F = 395.93, P < 0.001, RMA gradient = −0.297; bn = 459, log mass-specific RMR = 1.44 − 0.357 log body mass, r2 = 0.819, F = 2068.35, P < 0.001, RMA gradient = −0.323