Helms, president of the Natural Bridge Appalachian Trail Club in Lynchburg, walked first one way along the path, then the other, searching for the digital camera he had attached to a tree a month before. After looking for several minutes, he found it. Working quickly, Helms shut the camera off, detached it from the tree, replaced the camera’s photo card with a new one, and changed its batteries. He then walked down the animal trail two-thirds of a mile and reattached the camera to another tree, carefully positioning the camera so that the lens pointed toward the trail. Next, he bent over awkwardly, smiled, and moved to trigger the camera’s motion sensor. The camera took Helms’ picture, thus ensuring that it still works properly.