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Matthew BrownAugust 28, 201611min307

Record visitor numbers at the nation's first national park have transformed its annual summer rush into a sometimes dangerous frenzy, with selfie-taking tourists routinely breaking park rules and getting too close to Yellowstone's storied elk herds, grizzly bears, wolves and bison. Law enforcement records obtained by The Associated Press suggest such problems are on the rise at the park, offering a stark illustration of the pressures facing some of America's most treasured lands as the National Park Service marks its 100th anniversary.