This is the Red-billed Oxpecker. We saw many of these birds while driving in Kruger National Park. They like to eat ticks filled with blood so they ride around on animals cleaning the ticks off of them. We saw these birds on the backs of Cape Buffalo, Giraffes, Impala and Rhinoceros.
Camera: Canon EOS 5D Mark II
Lens: Canon EF70-300mm f/4-5.6 IS USM
Focal length: 300mm
Exposure time: 1/160 sec