Rock of Gibraltar may have originated from an escape of North African animals transported to Spain; it is also possible that the original Gibraltar macaques are a remnant of populations that are known to have spread throughout Southern Europe during the Pliocene, up to 5.5 million years ago. Some animals of the Rock have been reintroduced by the Alameda Wildlife Conservation Park who have three Barbary macaques. The Rock of Gibraltar, at the head of the Strait, is a prominent headland, which accumulates migrating birds during the passage periods. The vegetation on the Rock, unique in southern Iberia, provides a temporary home for
Timeline of the history of Gibraltar Museum said "this natural richness of wildlife and plants in the nearby sandy plains, woodlands, shrublands, wetlands, cliffs and coastline probably helped the Neanderthals to persist." Evidence at the cave shows the Neanderthals of Gibraltar likely used it as a shelter "for 100,000 years." Cro-Magnon man took over Gibraltar around 24,000 BCE. The Phoenicians are known to have visited the Rock circa 950 BC and named the Rock ""Calpe"". The Carthaginians also visited. However, neither group appears to have settled permanently. Plato refers to Gibraltar as one of the Pillars of Hercules along with Jebel Musa or Monte Hacho on