71-year-old Marian Barry lives full-time in a motorhome, moving between natural areas in the western United States. The former nurse receives $2,972 per month in Social Security benefits and reduces housing costs through volunteer work at parks, where she is provided a site with water and electricity hookups. From October to April she stays at Pahranagat National Wildlife Refuge in Nevada, and from May to August at Beaver Creek State Natural Area in Oregon.