Ecological niche model of distribution of majority of documented range of Meriones libycus (probability-of-occurrence key lower right). Red solid boxes indicate the highest probability of occurrence, dark blue ones indicate the lowest. Sample locations are shown as squares for training (white) and test (purple) conditions. Arabian M. libycus sample locations are marked as white stars. Previously suggested sub-specific limitations (according to Harrison and Bates ) are marked as white lines.