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Concern is increasing worldwide over land degradation from grazing, particularly by livestock. While grazing by herbivores, from insects to elephants, is a natural process, grazing that destroys vegetation and compacts soil inevitably degrades the land. Excessive or poorly timed grazing by any herbivore - domestic or wild - can harm soils, plants, aquatic species, and other wildlife. Problems are compounded when herbivores are confined by fences and when their numbers place excessive demands on forage or disproportionate grazing pressure on specific plant species