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Examination of the jaws of an impala population showed advanced wear on mandibular M1 compared with other ungulates which have been examined. This could lead to an erroneous interpretation of age if based upon mandibular tooth wear alone. Explanations are offered for this pattern in terms of the apparent pattern of wear of the impala molar teeth. Suggestions are also put forward for a method of determining specific age, from a conceptual wear model, when only extreme parameters are known. Horn growth in the male is also described.