A long-circulating legend tied the wild monkeys around Silver Springs State Park to Johnny Weismuller and Tarzan Finds a Son! in 1939, filmed in the area, but seventeen monkeys were actually brought to Devil's Island in 1938 and soon swam across the river to live in the nearby woods. Originally from the Philippine Islands, they were brought to Florida by a man popularly known as Colonel Tooey to enhance his Jungle Cruise boat rides on the Silver Springs River, and today colonies of more than 400 rhesus macaques live around Silver Springs State Park, though officials of the Florida Fish and Wildlife Commission have found that some carry a potentially dangerous herpes B virus and are developing a plan to remove them. Wild boars, or feral hogs and swine, came from domesticated stock said to have been brought to America by Spanish explorer Hernando de Sota in 1539, and Florida now has an estimated half-a-million of them because the state provides ideal habitat. They prefer marshes, hammocks, ponds, and drainage areas, often staying in dense brush in woods, fields, and wetlands but also entering populated areas for food. A mature six-month-old female can reach 200 pounds and 5-6 feet in length and can produce 2-3 litters a year with up to five piglets each. Wild boar live on the Greenway west of Route 200 and on the adjacent Halpata Tastanaki Preserve between the Ross Prairie and Pruitt Trailheads of the Florida Trail.