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
Gibraltar Rock State Natural Area Richmond Park. The Gibraltar Rock State Natural Area became a Wisconsin-designated natural area in 1969. It was originally owned by the county until 2007, when they transferred ownership to the Wisconsin Department of Natural Resources (WDNR). A celebration was held following the transfer of ownership. The Wisconsin Department of Natural Resources manages the Gibraltar Rock State Natural Area. Howard Van Ness made several paintings depicting the area prior to its designation as a state natural area. Friends of Gibraltar Rock exists and does "biological indexing of the flora and fauna in the area." The views from the natural area are