KLEIBER'S LAW
Your mass M (kg)
70
Exponent β
0.75
Mammals
Birds
All organisms
Metabolic rate B
—
Per-cell rate
—
Heart rate (est)
—
Lifespan (est)
—
Kleiber 1932: B ∝ M^(3/4)
WBE model (1997):
Fractal vascular networks
minimize transport cost
→ β = 3/4 exactly
Heart rate ∝ M^(-1/4)
Lifespan ∝ M^(1/4)