Fig. 10. Scaling of neonatal body mass for the sample of 109 primate species (data from Smith and Leigh, 1998), following subdivision into strepsirrhines (N=28) and haplorhines (N=81). Best-fit lines fitted separately to the two grades have approximately similar slopes that are both markedly lower than the slope of the single best-fit line in Fig. 8. Body mass (M_b in g).