The suspected source of the pigs is California where they are an invasive species causing some significant damage.
Oregon and Washington to reduce, hopefully eradicate, feral pigs. Seattle Times. AP
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Dr. Ralph Maughan is professor emeritus of political science at Idaho State University. He was a Western Watersheds Project Board Member off and on for many years, and was also its President for several years. For a long time he produced Ralph Maughan’s Wolf Report. He was a founder of the Greater Yellowstone Coalition. He and Jackie Johnson Maughan wrote three editions of “Hiking Idaho.” He also wrote “Beyond the Tetons” and “Backpacking Wyoming’s Teton and Washakie Wilderness.” He created and is the administrator of The Wildlife News.
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Wild hogs are often trapped and released into new areas by misguided hog hunters. That is how the German boar/feral hog strain began in California. Hell, they brought a whole boat load of Black Forest boar over and turned them loose in the 1920’s. The hogs are not big time migrators unless there is no food at all. I dont think they understand the depth of their problem.