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In page Rock of Gibraltar:

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The flora and fauna of the Gibraltar Nature Reserve are of conservation interest and are protected by law.[1] Within it is a range of animals and plants, but the highlights are the Barbary macaques (the famous Rock apes), the Barbary partridges, and flowers such as Gibraltar's own chickweed, thyme and the Gibraltar candytuft. The Barbary macaques 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.[2][3] Some animals of the Rock have been reintroduced by the Alameda Wildlife Conservation Park who have three Barbary macaques.