Extended Data Fig. 3: Microwear on the dentition of NMMNH P-27844.

(a) Right maxilla with three deciduous premolars and adult first molar in occlusal view, showing location of scanning electron microscopy (SEM) scan. (b) Overview secondary electron (SE) image of protocone of adult first molar, showing development of mesowear and location of close-up image. (c) Close-up SE image of scratches and gouges attributable to abrasive microwear; black arrows highlight curved scratches resulting from chewing motion. White arrows in (a) and (b) indicate lingual direction. Abbreviations: d, deciduous; M, upper molar; P, upper premolar.