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
Death on the Rock the Rock" subsequently became the first individual documentary to be the subject of an independent inquiry, in which it was largely vindicated. The project began after it emerged that the three IRA members shot in Gibraltar were found to be unarmed and not in possession of a bomb. The series' editor, Roger Bolton, dispatched journalists to Gibraltar and Spain, where they interviewed several people who witnessed the shootings as well as Spanish police officers who had been involved in surveillance of the IRA team. The journalists also filmed the funerals of the IRA members in Belfast. Satisfied by the journalists'