Ingo Arndt / Chimpanzee (Pan troglodytes) juvenile fishing for termites, endangered, Gombe Stream National Park, Tanzania

Gerry Ellis / Chimpanzee (Pan troglodytes) touching its foot, Gombe Stream National Park, Tanzania

Ingo Arndt / Buttressed root on rainforest tree, Gombe Stream National Park, Kakombe Valley, Tanzania

Ingo Arndt / Chimpanzee (Pan troglodytes) juvenile fishing for termites, endangered, Gombe Stream National Park, Tanzania

Ingo Arndt / Chimpanzee (Pan troglodytes) baby leaning against a tree, endangered, Gombe Stream National Park, Tanzania

Ingo Arndt / Chimpanzee (Pan troglodytes) mother with baby, endangered, Gombe Stream National Park, Tanzania

Ingo Arndt / Chimpanzee (Pan troglodytes) mother with two babies sleeping in a day nest, endangered, Gombe Stream National Park, Tanzania

Ingo Arndt / Chimpanzee (Pan troglodytes) alpha male 'Kris' knucklewalking across log, endangered, Gombe Stream National Park, Tanzania

Ingo Arndt / Chimpanzee (Pan troglodytes) alpha male 'Kris' portrait, endangered, Gombe Stream National Park, Tanzania

Patricio Robles Gil / Young girl with firewood, Usambara Mountains, north Tanzania

Patricio Robles Gil / Corn fields in the Usambara Mountains, northern Tanzania

Patricio Robles Gil / Spotted Hyena (Crocuta crocuta) carrying carcass, Selous Game Reserve, Tanzania