Operation: Flying Rhinos - Dereck and Beverley Joubert

If Africa's savannas represent the front lines of the war on wildlife, Dereck and Beverley Joubert are some of conservation's most decorated veterans. The couple tell about the time they saw poachers shooting into an elephant herd, and the unarmed pair chased them off. They're also working to diversify South Africa's rhino holdings by shipping 100 on a cargo jet to Botswana, which is currently the safest place in the rhino's range, due to the low level of government corruption.