Hey there, and welcome to another fun-filled day in the magnificent Luangwa valley. Its early morning and all the creatures are shaking off their feathers and fur to welcome the start of a new day. Today, Luca and Melua get up close to some rather heavy, helmeted giants. There's no wonder they're on the list of the big 5, the largest and most ferocious animals in Africa. That's right, these horned grass munchers are no gentle antelope - in fact, not even a mighty lion dares tangle with an angry buffalo.