Fig. 1.

Log length [log(L)] versus log number of species in each length class [log (S(L))] for terrestrial vertebrates. Data are from Fig. 12.7 in ref. 29. The regression line has a slope of approximately −3/2 (y = −1.6121x + 7.803; r² = 0.9267), consistent with scaling implied in Eqs. 1 and 3.