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The little-known pattern of aortic arch branching in the Rhinocerotidae has been determined in 10 individual rhinoceroses representing four of the five extant rhinoceros species. Present observations augment recorded information concerning this pattern of branching in the Asian rhinoceros forms and permit its first-time description in the African forms. They tentatively indicate the canonical pattern of aortic arch branching in certain rhinoceros species, and demonstrate the taxonomic insignificance of such branching.