Basal metabolic rate vs log
(body mass). The basal metabolic rate (BMR) is presented in three categories (low, intermediate and high). When the BMR value was not available for the species in study, either that of a close relative (indicated in parenthesis) or the average values of several closely related species (AVE) were used (together with the corresponding body mass value). The increase in BMR with the body mass can be easily observed by comparing the average values for each category (dotted lines).