Rancher Manuel Sanchez has lost four calves in as many weeks, all mysteriously mutilated. Authorities are baffled. (Joe Amon, The Denver Post) SAN LUIS — Manuel Sanchez tucks his leathery hands into well-worn pockets and nods toward a cedar tree where, last month, he found his fourth mysteriously slaughtered calf in as many weeks. "I have no idea what could do this. I wish I did," he says. Four calves, all killed overnight. Their innards gone. Tongues sliced out. Udders carefully removed. Facial skin sliced and gone. Eyes cored away. Not a single track surrounding the carcasses, which were found...