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Nine specimens of Steatomys jacksoni Hayman, were caught in the derived savanna zone of South-western Nigeria, eight of them from Olokemeji and one from Aje-Pero. Only three of these specimens were kept for morphometric studies. Two of these specimens were subadults while the third was an adult female. The behavior of the mice upon capture is described. It is postulated that S. jacksoni could be widely distributed in West Africa.