FIG. 40.3 Resting metabolic rate and body size in diverse organisms. The relationship plotted here shows that larger animals have lower metabolic rates per gram of tissue than smaller animals. Source: Adapted from A. M. Hemingsen, 1960, “Energy metabolism as related to body size and respiratory surfaces, and its evolution.” Re. Steno Memorial Hospital Nordisk Insulinlaboratorium 9:1–110.