Fig. 7: Non-hominin fossils recovered in Area 13 from 2017 to 2019.

Thirty-two taxonomically identifiable vertebrate fossils were collected (a, b). Miscellaneous bovids are those specimens for which a specific tribe could not be determined. Antilopini and Aepycerotini cannot consistently be differentiated based on isolated molars and are pooled together. c, d New and existing upper Burgi Member enamel isotopic data. New enamel isotopic data from Area 13 (red triangles) are not incorporated into boxplots. Median values are represented by vertical lines within the box, the edges of the boxes represent quartile ranges, horizontal dashed lines represent the range and outlier values are plotted as circles outside of the range. Raw δ¹³C and δ¹⁸O, presented as circles superimposed on the box plots, are consistent with open habitats that had C₄-dominated diets and locally arid conditions, and with the upper Burgi isotopic signatures more broadly. Silhouettes are from http://phylopic.org, with attribution to A. Venter, Herbert H. T. Prins, David A. Balfour, and Rob Slotow (vectorized by T. Michael Keesey) for Reducini, Alcelaphini, Tragelaphini, and miscellaneous bovid (https://creativecommons.org/licenses/by/3.0/). The source data underlying Fig. 7 are provided in the Source data file.