For more than half a century, grizzly bears roamed free in the national parks without causing a human fatality. Then in 1967, on a single August night, two campers were fatally mauled by enraged bears -- thus signaling the beginning of the end for America's greatest remaining land carnivore. Night of the Grizzlies, Olsen's brilliant account of another sad chapter in America's vanishing frontier, traces the causes of that tragic night: the rangers' careless disregard of established safety precautions and persistent warnings by seasoned campers that some of the bears were acting "funny"; the comforting belief that the great bears were not really dangerous -- would attack only when provoked.