The most famous mammals on the Rock are of course the Barbary Macaques. Little is known about their origin, although they were probably introduced by the British.
Apart from these, few mammals are found in the Reserve. A small population of Wild Rabbits can be found scurrying in the underbrush and off beaten trails. Several bat species also make their home within crags and cliffs like the European Free-tailed Bat. Other species are found roosting and breeding within the caves and tunnels of the Rock.