Young noisy male elephant, maybe in musth, charging the vehicle. He got within about 6 feet (2 meters) before stopping. The ranger snapped his fingers and it startled the young guy and he turned and left shortly after the shot was taken. The reason I think he might have been in musth is his visible 5th leg :). Note that focal length was only 100mm, he was very close !
Phinda Private Reserve, South Africa
Canon EOS 1Ds Mark II ,Canon EF 100-400mm f/4.5-5.6L IS USM 1/200s f/5.6 at 100.0mm iso800