Cathy Hayes was cracking jokes as she recorded a close encounter with a buffalo on her camera in a recent visit to Yellowstone National Park. "Watch Donald get gored," she said as her companion hustled toward a grazing one-ton beast for a closer shot with his own camera. Seconds later, as if on cue, the buffalo lowered its head, pawed the ground and charged, injuring, as it turns out, Ms. Hayes. "We were about 30, 35 feet, and I zoomed in on him, but that wasn't far enough, because they are fast," she recounted later in a YouTube video displaying her bruised and cut legs. _The national parks' history is full of examples of misguided visitors feeding bears, putting children on buffalos for photos and dipping into geysers despite signs warning of scalding temperatures. But today, as an ever more wired and interconnected public visits the parks in rising numbers -- July was a record month for visitors at Yellowstone -- rangers say that technology often figures into such mishaps.