“…At both Yellowstone and Isle Royale before the arrival of wolves, the condition of the vegetation was a source of concern and disagreement (Mech 1966, Pritchard 1999, NRC 2002. The controversy evaporated at Isle Royale when wolves were established and a natural "balance" was assumed to exist, although some people feared the wolves would kill all the moose and then start in on the people (Isle Royale National Park files, letter to the Superintendent, 1956).…”