Coordinates: 36°07′56″N 5°20′56″W / 36.132248°N 5.348875°W
The Barbary macaque population in Gibraltar is the only wild monkey population in the European continent. Although most populations in Africa are facing declining populations due to hunting and deforestation, the population of Barbary monkeys in Gibraltar is growing. At present, some 300 animals in five troops occupy the area of the Upper Rock area of the Gibraltar Nature Reserve, though occasional forays into the town may result in damage to personal property. As they are a tailless species, they are also known locally as Barbary apes or rock apes, despite being monkeys (Macaca sylvanus). The local people simply refer to them as monos (English: monkeys) when conversing in Spanish or Llanito (the local vernacular).
All Gibraltar Barbary macaques are descended from North African populations of Barbary macaques. DNA evidence has established the present population is of relatively recent Algerian and Moroccan origin. No traces were found of a third source for their DNA, namely of a now-extinct ancient Iberian population. An earlier theory, now disproven by the DNA evidence, was that the original Gibraltar macaques were a remnant of populations that had spread throughout Southern Europe during the Pliocene, up to 5.5 million years ago. The Macaca sylvanus species is listed as endangered by the IUCN Red List and is declining. About 75% of the total population is found in the Middle Atlas mountains.