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
Gray-bellied night monkey Gray-bellied night monkey The gray-bellied night monkey ("Aotus lemurinus"), also called the grey-legged douroucouli or lemurine owl monkey, is a small New World monkey of the family Aotidae. Native to tropical and subtropical forests of South America, the gray-bellied night monkey faces a significant threat from hunting, harvesting for use in pharmaceutical research and habitat destruction. There have been up to four subspecies of the gray-bellied night monkey. All but the nominate subspecies have been elevated to full species rank. The three species formally considered subspecies are: Additionally, Hershkovitz's night monkey "Aotus hershkovitzi" is now considered to be a junior