I found in mammals and birds that larger animals will have a higher metabolic rate. The values increase as they go from left to right. (Fig. 1a, 1b)
I found that in reptiles and amphibians as the organism gets larger the metabolic rate increases. The values increase as they go from left to right. (Fig. 1c, 1d)
Both relationships are the same.
Larger animals will need to have a higher metabolic rate to produce more energy to survive.
In mammals and birds, the smaller animals will have higher mass-specific BMR. (Fig. 2a, 2b)
In reptiles and amphibians, smaller animals will have a larger mass-specific BMR. (Fig. 2c, 2d)
Both relationships are the same.