Fig. 1.

(A) Range of δ⁶⁶Zn values (relative to the JMC-Lyon Zn isotope standard; ref. 74) in tooth enamel for carnivores (red), omnivores (black), and herbivores (green) of the THM cave assemblage. The boxes from the box and whisker plots represent the 25th–75th percentiles, with the median as a bold horizontal line. (B) Distribution of enamel δ⁶⁶Zn versus δ¹³C_apatite values of the THM cave assemblage (SI Appendix, Table S3), where “C₃ environment” and “C₄ environment” are, respectively, defined by δ¹³C_apatite < −8‰ and > −2‰. Dashed lines represent the full range of variation and full lines represent 40% predictive ellipses (using R statistical software and package “SIBER”; refs. 72 and 75).