Visitor misbehavior abounds as US parks agency turns 100

Tourist John Gleason crept through the grass, four small children close behind, inching toward a bull elk with antlers like small trees at the edge of a meadow in Yellowstone National Park."They're going to give me a heart attack," said Gleason's mother-in-law, Barbara Henry, as the group came within about a dozen yards of the massive animal.The elk's ears then pricked up, and it eyed the children and Washington state man before leaping up a hillside. Other tourists — likewise ignoring rul