DECIVILIZATION: Cost of Colorado’s forced wolf introduction already rising; a ‘circular self-destruction formula.’ “According to the U.S. Fish & Wildlife Service, after the 1994 forced wolf introduction to Yellowstone National Park, through 2012, elk herds decreased by more than 80%. Most of the natural dispersion of wolves in the west since 1994 centers on the Yellowstone packs. As wolf populations increase and prey species decrease wolves migrate in search of better prey opportunities and open range for the new packs.”