Infographic: Metabolic Theory in Elephants and Mice
 |  | ||
Characteristic | Units & Formula | Mouse | Elephant |
Weight | Grams | 20 | 2,000,000 |
Metabolic rate | Watts 4.1 M 0.75 | 20.5 | 1226 |
Metabolic rate/weight | Watts/grams 0.018 M -0.25 | 0.049 | 0.0027 |
Heart rate | Beats per minute 240 M-0.25 | 640 | 36 |
Lifespan | Years 5.3 M0.25 | 2 | 35 |
Heartbeats/lifetime | 700,000,000 | 700,000,000 | |
Respiration rate | Breaths per minute 54 M -0.25 | 145 | 8 |
Breaths per lifetime | 150,000,000 | 150,000,000 | |
Duration of pregnancy | Days 60 M0.25 | 23 | 401 |
Population doubling time | Years 0.6 M0.25 | 0.22 | 4 |
Population density | Individuals per square kilometer 100 M-0.75 | 1800 | 0.33 |
Rate of DNA base substitution | % substitutions per million years 3.8 M-0.25M | 10 | 0.6 |
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