It is mid-morning, and terrified Ernest is charging as fast as he can toward Lake Nakuru in the heart of Kenya's scenic Rift Valley, sending a flock of pink flamingos squawking into flight. The 3-year-old white rhino is the target of wildlife authorities trying to capture him and take him to another game park hundreds of miles away. They are keen to revive the number of rhinos which were nearly wiped out in a poaching attack years ago.