Biology
Metabolic Allometry (Kleiber's Law)
BMR ∝ M^¾

Basal metabolic rate scales as the three-quarter power of body mass across the animal kingdom, so a doubling of mass raises energy demand only about 68% — larger bodies burn less per gram.
Computed & rendered in pure C# on the frozen OnlyCSharp 1.8 library — animation baked to GIF with the library's own
Gif encoder (no GPU, no ffmpeg, no external packages).