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Park rangers have a wide variety of duties that range from conservation efforts to bookkeeping. Their first responsibility is, however, safety. Rangers who work in parks with treacherous terrain, dangerous wildlife, or severe weather must make sure hikers, campers, and backpackers follow outdoor safety codes. They often require visitors to register at park offices so that rangers will know when someone does not return from a hike or climb and may be hurt. Rangers often participate in search-and-rescue missions for visitors who are lost or injured in parks. In mountainous or forested regions, they may use helicopters or horses for searches.