Fig. S2.

Body size vs. δ¹³C values of tooth enamel for fossil assemblages with isotopic data from multiple primate taxa for (A) Aramis, (B) Woranso-Mille 3.76−3.57 Ma, (C) Waranso-Mille 3.47−3.2 Ma, (D) Makapansgat, (E) Sterkfontein, and (F) Swartkrans. Size is plotted as the midpoint between the mean estimated body mass for females and males and is used here as a way to represent the range of physiologies among primates at a site. Error bars for body size represent the midpoint between male and female body mass. If error bars are missing, then data represent the only data available, which is either the mean value for males or females or an average estimate for the species. The body mass of the Woranso-Mille hominins is plotted both as the full estimated range for early Pliocene hominins and also as a more restricted range for Au. afarensis, both from ref. 73. The δ¹³C values are plotted as the means of the available data in reference to VPDB; error bars represent 1σ on the mean but are missing if n = 1. See Dataset S1 for the δ¹³C data from Woranso-Mille, Dataset S2 for the δ¹³C data from other sites, and Dataset S6 for body mass data.