A Left side view of the skull of Eurhinoceros sondaicus (juv.), specimen NHM-DMA-26801/1, collected in Java, 1838. Credit: Natural History Museum, Oslo. Adapted from Matschiner (2021: 4842), with permission from Elsevier Eds. Photograph by Lars Erik Johannessen B left side view of the skull of Rhinoceros unicornis (juv.), Smithsonian NMAH. Licensed under CC BY-SA 4.0. The image has been modified by isolating the skull and inverting its position horizontally. Photograph by David J. Stang C partial ventral view of the cranium of Eurhinoceros sondaicus D partial ventral view of the cranium of Rhinoceros unicornis. Adapted from Flower (1876: 446, 447). Main cranial differences outlined following Colbert (1942). Refer to Table 2 for numbered annotations.