This study was based on 96 hares (Lepus sp.) obtained from three geographic regions separated by the Nile and it's tributaries in Sudan during 2012 and 2015, in order to determine the skull craniometric variations. The parameters measured were the anterior nasal width (ANW); external nasal length (ENL); foramen incisivum length (FIL); foramina incisive width (FIW); facial tubercle length (FTL); internal nasal length (INL); lower cheek tooth row length (LCTRL); upper cheek-tooth row length (UCTRL); mandible height (MH); mandible length (ML); palatal lh (PL); posterior nasal width (PNW); post palatal width (PPW); posterior zigomatic width (PZW); rostral width (RW); smallest frontal width (SFW); tympanic bulla length (TBL); tympanic bulla width (TBW); and width between facial tubercles (WFT). It was found that the parameters from east and west of the Nile were similar, but greater than their counterparts between the Blue Nile and the White Nile tributaries of the Nile. ). Tympanic bulla width was wider in males compared with females. It is concluded that hares from the three regions are likely not conspecific but are sexually dimorphic.

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