Photojournalist Jim Cammack was struck by an odd sight at Sweetwater’s annual spring rattlesnake roundup: a man with a tail. No, the man, a Jaycees volunteer, was not participating in a roundup-sanctioned snake-wrestling contest. He was demonstrating one technique for holding the powerful Western diamondback while milking its venom. The decades-old roundup has been criticized by environmentalist and animal-rights groups, but its organizers defend it on humanitarian grounds: The venom is sent to medical research and anti-venin labs.