A rare wolverine has been documented in the Tahoe National Forest — the first confirmed sighting of the animal in nearly three-quarters of a century. A graduate student had been conducting research in the forest on the effects of landscape change on American martens, a bird species. The project uses a large array of cameras that remotely capture images of martens and other animals through the use of motion sensors or heat detectors. However, one of the cameras captured an image from behind of a larger animal with telltale black and brown markings that experts say is a wolverine.