Four-year-old white rhinoceros Vince, pictured, was shot dead at Thoiry zoo. He was expected to reach between 40 and 50-years-old. A British zoo has stepped up its security measures after poachers killed a rhino in a French safari park and cut off its horn with a chainsaw. The four-year-old animal, called Vince, was found dead in Thoiry zoo, not far from Paris, after the savage raid on Monday night. In...