Deep in the rugged mountains of South Carolina, a silent guardian slithers through the underbrush — the timber rattlesnake. Majestic. Misunderstood. Essential. In this episode of "What’s Wild," follow South Carolina Department of Natural Resources biologists as they trek into remote terrain to capture, tag and study these elusive snakes — even newborns — in the fight against a mysterious fungal disease threatening their survival. Every tag. Every signal. Every slither. Each reveals a hidden stor