Mitsuaki Iwago / African Elephant (Loxodonta africana) male feeding, Ngorongoro Crater, Tanzania

Mitsuaki Iwago / Warthog (Phacochoerus africanus) portrait, Serengeti National Park, Tanzania

Mitsuaki Iwago / Leopard (Panthera pardus) resting in tree, Serengeti National Park, Tanzania

Mitsuaki Iwago / Masai Giraffe (Giraffa tippelskirchi) trio crossing grasslands, Serengeti National Park, Tanzania

Mitsuaki Iwago / Spotted Hyena (Crocuta crocuta) sleeping on back, Serengeti

Mitsuaki Iwago / Spotted Hyena (Crocuta crocuta) laughing, Serengeti

Mitsuaki Iwago / Masai Giraffe (Giraffa tippelskirchi) mothers and young running, Serengeti National Park, Tanzania

Gerry Ellis / Mist atop hillsides covered in low montane tropical rainforest inside, Gombe Stream National Park, Tanzania

Gerry Ellis / Gombe stream flowing through dense low montane tropical rainforest inside Gombe Stream National Park, Tanzania

Gerry Ellis / African Elephant (Loxodonta africana) herd foraging, Tarangire National Park, Tanzania

Mitsuaki Iwago / Ostrich (Struthio camelus) male and two females running, Serengeti National Park, Tanzania

Fiona Rogers / Eastern Chimpanzee (Pan troglodytes schweinfurthii) three year old juvenile male, Gombe National Park, Tanzania

Fiona Rogers / Eastern Chimpanzee (Pan troglodytes schweinfurthii) eighteen year old male, Gombe National Park, Tanzania

Fiona Rogers / Eastern Chimpanzee (Pan troglodytes schweinfurthii) juvenile male, eight years old, Gombe National Park, Tanzania

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) thirty-six year old male feeding on fruit, Gombe National Park, Tanzania

Anup Shah / Olive Baboon (Papio anubis) sub-adult, Gombe National Park, Tanzania

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) twenty-three year old male, Gombe National Park, Tanzania

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) juvenile male, eight years old, looking at stream, Gombe National Park, Tanzania

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) sub-adult male, fourteen years old, Gombe National Park, Tanzania

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) sub-adult male, fourteen years old, Gombe National Park, Tanzania

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) juvenile female, three years old, smelling her hand, Gombe National Park, Tanzania

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) sub-adult female, thirteen years old, drinking water from stream using leaves as sponge tool, Gombe National Park, Tanzania

Thomas Marent / Full moon with tree branches, Serengeti National Park, Tanzania

Thomas Marent / Microhylid Frog (Microhylidae) froglet with tadpole tail, Tanzania

Fiona Rogers / Eastern Chimpanzee (Pan troglodytes schweinfurthii) seven year old juvenile female, named Familia, picking her nose and eating its contents, Gombe National Park, Tanzania

Cyril Ruoso / Eastern Chimpanzee (Pan troglodytes schweinfurthii) juvenile sleeping in his nest, Gombe National Park, Tanzania

Cyril Ruoso / Eastern Chimpanzee (Pan troglodytes schweinfurthii) juvenile in nest for the night, Gombe National Park, Tanzania

Konrad Wothe / Deciduous forest on shore of Lake Tanganyika, Mahale Mountains National Park, Tanzania

Konrad Wothe / Creek in rainforest, Mahale Mountains National Park, Tanzania

Konrad Wothe / Ilomba (Pycnanthus angolensis) fruit on rainforest floor, Mahale Mountains National Park, Tanzania

Konrad Wothe / Red-knobbed Sea Star (Protoreaster linckii) pair in shallow water, Zanzibar, Tanzania

Suzi Eszterhas / Poacher's camp with hides, meat, and skulls of wildebeest and impala found and confiscated by Mara Conservancy rangers, Serengeti National Park, Tanzania

Kevin Schafer / Masai Giraffe (Giraffa tippelskirchi) young, Serengeti National Park, Tanzania

Kevin Schafer / Striped Hyena (Hyaena hyaena), Serengeti National Park, Tanzania

Suzi Eszterhas / Olive Baboon (Papio anubis), Gombe Stream Chimp Reserve, Tanzania

Suzi Eszterhas / Serval (Leptailurus serval) adult, Ngorongoro Conservation Area, Tanzania, east Africa

Suzi Eszterhas / Serval (Leptailurus serval) portrait, Ngorongoro Conservation Area, Tanzania, east Africa

Mitsuaki Iwago / Dung Beetle (Scarabaeus pius) group processing dung, Serengeti National Park, Tanzania

Mitsuaki Iwago / Rock Hyrax (Procavia capensis) group in rock crevice, Serengeti National Park, Tanzania

Mitsuaki Iwago / Spotted Hyena (Crocuta crocuta) two pups at burrow entrance, Serengeti

Mitsuaki Iwago / Masai Giraffe (Giraffa tippelskirchi) young resting, Serengeti National Park, Tanzania

Mitsuaki Iwago / Flamingo (Phoenicopterus sp) flock in wetland, Serengeti National Park, Tanzania

Mitsuaki Iwago / Masai Giraffe (Giraffa tippelskirchi) pair silhouetted at sunset, Serengeti National Park, Tanzania

Mitsuaki Iwago / Warthog (Phacochoerus africanus) pair running, Serengeti National Park, Tanzania

Mitsuaki Iwago / Spotted Hyena (Crocuta crocuta) mother nursing pup while another Hyena sniffs her for identification, Serengeti

Mitsuaki Iwago / Spotted Hyena (Crocuta crocuta) pair mating, Serengeti

Mitsuaki Iwago / Spotted Hyena (Crocuta crocuta) couple mating, Serengeti

Gerry Ellis / Soda and algae formation on surface of Lake Natron, Great Rift Valley, Tanzania

Mitsuaki Iwago / Secretary Bird (Sagittarius serpentarius) portrait, Serengeti National Park, Tanzania

Mitsuaki Iwago / Rock Hyrax (Procavia capensis) group of adults and young huddled together on a rock, Serengeti National Park, Tanzania

Mitsuaki Iwago / Ostrich (Struthio camelus) male tending eggs in nest, Serengeti National Park, Tanzania

Mitsuaki Iwago / Rock Hyrax (Procavia capensis) family, Serengeti National Park, Tanzania

Gerry Ellis / Ecotourists in the Serengeti ecosystem, Kenya and Tanzania border

Konrad Wothe / White-backed Vulture (Gyps africanus) flying, Serengeti, Tanzania

Gerry Ellis / Gombe Stream flowing through dense low montane tropical rainforest inside Gombe Stream National Park, Tanzania

Mitsuaki Iwago / Spotted Hyena (Crocuta crocuta) feeding on Flamingo (Phoenicopterus sp), Ngorongoro Crater, Tanzania

Konrad Wothe / Rothschild Giraffe (Giraffa camelopardalis rothschildi), Lake Manyara National Park, Tanzania

Konrad Wothe / Tarangire River, Tarangire National Park, Tanzania, east Africa

Konrad Wothe / Olduvai Gorge, Tanzania, east Africa

Mitsuaki Iwago / Spotted Hyena (Crocuta crocuta) resting, Serengeti

Gerry Ellis / African Elephant (Loxodonta africana) group under Umbrella Thorn trees, Tarangire National Park, Tanzania

Konrad Wothe / Olive Baboon (Papio anubis) troop, Lake Manyara National Park, Africa

Mitsuaki Iwago / Leopard (Panthera pardus) two year old walking through dry grass, Serengeti National Park, Tanzania

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) five year old juvenile female, named Fadhila, Gombe National Park, Tanzania

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) five year old juvenile female, named Fadhila, Gombe National Park, Tanzania

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) five year old juvenile female, named Fadhila, scratching herself, Gombe National Park, Tanzania

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) five year old juvenile female, named Fadhila, Gombe National Park, Tanzania

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) five year old juvenile female, named Fadhila, Gombe National Park, Tanzania

Fiona Rogers / Eastern Chimpanzee (Pan troglodytes schweinfurthii) five year old juvenile female, named Fadhila, Gombe National Park, Tanzania

Fiona Rogers / Eastern Chimpanzee (Pan troglodytes schweinfurthii) five year old juvenile female, named Fadhila, Gombe National Park, Tanzania

Fiona Rogers / Eastern Chimpanzee (Pan troglodytes schweinfurthii) five year old juvenile female, named Fadhila, Gombe National Park, Tanzania

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) nine year old juvenile male, Gombe National Park, Tanzania

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) four year old juvenile male grooming himself, Gombe National Park, Tanzania

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) nine year old juvenile male grooming himself, Gombe National Park, Tanzania

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) four year old juvenile male, Gombe National Park, Tanzania

Fiona Rogers / Eastern Chimpanzee (Pan troglodytes schweinfurthii) four year old juvenile male, Gombe National Park, Tanzania

Fiona Rogers / Eastern Chimpanzee (Pan troglodytes schweinfurthii) four year old juvenile male, Gombe National Park, Tanzania

Fiona Rogers / Zanzibar Red Colobus (Procolobus kirkii) juvenile, Jozani Chwaka Bay National Park, Zanzibar, Tanzania

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) sub-adult male, twelve years old, Gombe National Park, Tanzania

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) sub-adult male, twelve years old, Gombe National Park, Tanzania

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) juvenile male, eleven years old, taking food from sub-adult thirteen year old female, Gombe National Park, Tanzania

Fiona Rogers / Eastern Chimpanzee (Pan troglodytes schweinfurthii) thirteen year old sub-adult female, named Glitter, Gombe National Park, Tanzania

Fiona Rogers / Eastern Chimpanzee (Pan troglodytes schweinfurthii) seven year old juvenile female orphan, named Mambo, Gombe National Park, Tanzania

Fiona Rogers / Eastern Chimpanzee (Pan troglodytes schweinfurthii) thirteen year old sub-adult female, named Glitter, Gombe National Park, Tanzania

Fiona Rogers / Eastern Chimpanzee (Pan troglodytes schweinfurthii) fifteen year old sub-adult male, named Sampson, Gombe National Park, Tanzania

Anup Shah / Eastern Chimpanzee (Pan troglodytes schweinfurthii) thirteen year old sub-adult female, named Glitter, Gombe National Park, Tanzania

Konrad Wothe / Ilomba (Pycnanthus angolensis) fruit in rainforest, Mahale Mountains National Park, Tanzania

Gerry Ellis / View from south rim along western wall of Ngorongoro Crater, Tanzania

Mitsuaki Iwago / Hippopotamus (Hippopotamus amphibius) pair cross grassland, Serengeti National Park, Tanzania

Mitsuaki Iwago / Lappet-faced Vulture (Torgos tracheliotus) landing, Serengeti National Park, Tanzania

Konrad Wothe / View from forested rim into floor of Ngorongoro Crater, Tanzania