Deep in the Sierra Nevada foothills on the Tule River Indian Reservation, tribal member Kenneth McDarment had passed by an ochre-red pictograph countless times throughout his life—a simple yet unmistakable image of a beaver with four paws and a distinctive paddle tail. Estimated to be between 500 and 1,000 years old, this ancient artwork adorned the walls of a rock shelter alongside other paintings of wildlife, humans, and geometric designs crea…