Mitsuaki Iwago / Burchell's Zebra (Equus burchellii) trio on dusty plain, Serengeti National Park, Tanzania

Mitsuaki Iwago / Hippopotamus (Hippopotamus amphibius) standing in water, Serengeti National Park, Tanzania

Gerry Ellis / Chimpanzee (Pan troglodytes) portrait, Gombe Stream National Park, Tanzania

Gerry Ellis / Olive Baboon (Papio anubis) confrontation, Gombe Stream National Park, Tanzania