ZSSD / Queensland Koala (Phascolarctos cinereus adustus) in eucalyptus tree, native to Queensland

ZSSD / Bonobo (Pan paniscus) female playing with youngster by throwing him up in the air, native to Africa

ZSSD / Western Lowland Gorilla (Gorilla gorilla gorilla) scratching its head, native to Africa

ZSSD / Eclectus Parrot (Eclectus roratus) male, native to Australia and southeast Asia

ZSSD / Eurasian Lynx (Lynx lynx), native to Europe

ZSSD / Blue Poison Dart Frog (Dendrobates azureus) very tiny poisonous frog, Indian tribes use poison for arrows, native to South America, San Diego Zoo, California

ZSSD / Bighorn Sheep (Ovis canadensis) male, native to North America, San Diego Zoo Safari Park, California

ZSSD / Giant Panda (Ailuropoda melanoleuca) cub in tree, endangered, native to China

ZSSD / Andean Cock-of-the-rock (Rupicola peruvianus) portrait, native to Andean cloud forests

ZSSD / Scarlet Macaw (Ara macao) pair kissing, native to South America

ZSSD / Rothschild Giraffe (Giraffa camelopardalis rothschildi) mother kissing calf, native to Africa

ZSSD / Rothschild Giraffe (Giraffa camelopardalis rothschildi) mother nuzzling calf, native to Africa

ZSSD / Giant Panda (Ailuropoda melanoleuca) named Mei Sheng on exhibit, native to Asia

Karl Ammann / Bonobo mother and baby {Pan paniscus} San Diego Zoo, CA, USA

ZSSD / Nymphalid Butterfly (Nymphalidae) pair, San Diego Zoo, California

ZSSD / Mantid (Mantidae) camouflaged in leaf litter, San Diego Zoo, California

ZSSD / California Condor (Gymnogyps californianus) egg handled by keeper, San Diego Zoo, California

ZSSD / Stick Insect held by keeper, San Diego Zoo, California

Tui De Roy / Hood island giant tortoise (Chelonoidis nigra hoodensis) "Diego", old male returned to Galapagos from the San Diego Zoo in 1977 for captive breeding program, Tortoise Breeding Centre, Puerto Ayora, Sa...

Tui De Roy / Hood island giant tortoise (Chelonoidis nigra hoodensis) feed, old male 'Diego' returned to Galapagos from the San Diego Zoo in 1977 for captive breeding program, Tortoise Breeding Centre, Puerto Ayor...

Tui De Roy / Saddleback Galapagos Tortoise (Chelonoidis nigra hoodensis) named Diego, an old male returned to the Galapagos from the San Diego Zoo in 1977 and sire of large number of young in captive breeding prog...

Tui De Roy / Saddleback Galapagos Tortoise (Chelonoidis nigra hoodensis) named Diego, an old male returned to the Galapagos from the San Diego Zoo in 1977 and sire of large number of young in captive breeding prog...

Tui De Roy / Saddleback Galapagos Tortoise (Chelonoidis nigra hoodensis) named Diego, an old male returned to the Galapagos from the San Diego Zoo in 1977 and sire of large number of young in captive breeding prog...

Tui De Roy / Saddleback Galapagos Tortoise (Chelonoidis nigra hoodensis) named Diego, an old male returned to the Galapagos from the San Diego Zoo in 1977 and sire of large number of young in captive breeding prog...

ZSSD / Kob (Kobus kob) males sniffing each other, native to Africa

ZSSD / African Elephant (Loxodonta africana) trio, native to Africa

ZSSD / White Rhinoceros (Ceratotherium simum) calling, native to Africa

ZSSD / White Rhinoceros (Ceratotherium simum) portrait, native to Africa

ZSSD / Rothschild Giraffe (Giraffa camelopardalis rothschildi) walking, native to Africa

ZSSD / Caracal (Caracal caracal) portrait, native to Africa

ZSSD / Yellow-billed Stork (Mycteria ibis) pair preening, native to Africa

ZSSD / California Condor (Gymnogyps californianus) portrait, native to North America

ZSSD / Bearded Vulture (Gypaetus barbatus), native to Africa, Europe, and Asia

ZSSD / California Condor (Gymnogyps californianus) portrait, native to North America

ZSSD / Polar Bear (Ursus maritimus) trio around den, native to North America

ZSSD / Bonobo (Pan paniscus) sub-adult and baby, native to Africa

ZSSD / Jaguar (Panthera onca) walking, native to Central and South America

ZSSD / Western Lowland Gorilla (Gorilla gorilla gorilla) portrait, native to Africa

ZSSD / Western Lowland Gorilla (Gorilla gorilla gorilla) profile, native to Africa

ZSSD / Boelen's Python (Morelia boeleni) portrait, native to New Guinea

ZSSD / Guyana Caiman Lizard (Dracaena guianensis) eating prey, native to South America

ZSSD / Southern Pacific Rattlesnake (Crotalus viridis helleri) coiled up showing head with sensory pit organ, North America

ZSSD / Meerkat (Suricata suricatta) group, native to Africa

ZSSD / Indian Rhinoceros (Rhinoceros unicornis) mother and calf, native to India

ZSSD / Indian Rhinoceros (Rhinoceros unicornis) mother and calf in water, native to India

ZSSD / Brown Bear (Ursus arctos) portrait, native to Europe and North America

ZSSD / Tree Pangolin (Manis tricuspis) skin, native to Africa

ZSSD / African Elephant (Loxodonta africana) and Asian Elephant (Elephas maximus), native to Africa and Asia

ZSSD / Przewalski's Horse (Equus ferus przewalskii) mother and foal walking, native to Asia

ZSSD / California Condor (Gymnogyps californianus), native to North America

ZSSD / Jaguar (Panthera onca) walking, native to Central and South America

ZSSD / Jaguar (Panthera onca) portrait, native to Central and South America

ZSSD / Malayan Tiger (Panthera tigris jacksoni) cub walking, native to Malaysia

ZSSD / Malayan Tiger (Panthera tigris jacksoni) cubs, native to Malaysia

ZSSD / Malayan Tiger (Panthera tigris jacksoni) snarling, native to Malaysia

ZSSD / Sarus Crane (Grus antigone) portrait, native to Asia and Australia

ZSSD / Rothschild Giraffe (Giraffa camelopardalis rothschildi) with long extended tongue, native to Africa

ZSSD / Greater Flamingo (Phoenicopterus ruber) parent feeding chick, native to Africa and Europe

ZSSD / Polar Bear (Ursus maritimus) pair fighting, native to North America

ZSSD / Red River Hog (Potamochoerus porcus) piglet running, native to Africa

ZSSD / Giant Panda (Ailuropoda melanoleuca) resting in tree, native to China

ZSSD / Red-bellied Short-necked Turtle (Emydura subglobosa) babies, native to Australia

ZSSD / Red River Hog (Potamochoerus porcus) three piglets, native to Africa

ZSSD / Queensland Koala (Phascolarctos cinereus adustus) walking across open ground, native to Queensland

ZSSD / Orb-weaver Spider (Paraplectana sp) on web showing underside of abdomen, worldwide distribution

ZSSD / Queensland Koala (Phascolarctos cinereus adustus) eating eucalyptus leaf, native to Queensland

ZSSD / South African Gemsbok (Oryx gazella gazella), native to Africa

ZSSD / Meerkat (Suricata suricatta) trio, native to Africa

ZSSD / Meerkat (Suricata suricatta) group of four standing in a line, native to Africa

ZSSD / Slender Loris (Loris tardigradus) mother and baby, native to Sri Lanka

ZSSD / Cream-spotted Clearwing (Tithorea tarricina) butterfly, native to Central and South America

ZSSD / Red Rattlesnake (Crotalus ruber) portrait showing eye and pit sensory organ, native to North America

ZSSD / Guyana Caiman Lizard (Dracaena guianensis) flicking forked tongue, native to South America

ZSSD / Brazilian Lancehead (Bothrops moojeni) snake showing eye and pit sensory organ, native to South America

ZSSD / Brazilian Lancehead (Bothrops moojeni) snake showing nostril and pit sensory organ, native to South America

ZSSD / White Rhinoceros (Ceratotherium simum) pair fighting, native to Africa

ZSSD / Green Mamba (Dendroaspis viridis) snake is the largest venomous snake in Africa, native to Africa

ZSSD / Rothschild Giraffe (Giraffa camelopardalis rothschildi) portrait, native to Africa

ZSSD / Giant Panda (Ailuropoda melanoleuca) cub, native to China

ZSSD / Giant Panda (Ailuropoda melanoleuca) mother and cub, native to China

ZSSD / White Rhinoceros (Ceratotherium simum), native to Africa

ZSSD / African Elephant (Loxodonta africana) mother and calf, native to Africa

ZSSD / Mountain Lion (Puma concolor) cub portrait, San Diego Zoo, California

ZSSD / Sumatran Tiger (Panthera tigris sumatrae) cub jumping onto rock, endangered species native to Sumatra, San Diego Zoo Safari Park, California

ZSSD / Sumatran Tiger (Panthera tigris sumatrae) cub running, endangered species native to Sumatra,San Diego Zoo Safari Park, California

ZSSD / Blue Poison Dart Frog (Dendrobates azureus) very tiny poisonous frog, Indian tribes use poison for arrows, native to South America, San Diego Zoo, California

ZSSD / Tomato Frog (Dyscophus antongilii) very rare in nature and native to Madagascar, San Diego Zoo, California

ZSSD / Panamanian Golden Frog (Atelopus zeteki) critically endangered species native to Panama, San Diego Zoo, California

ZSSD / Panamanian Golden Frog (Atelopus zeteki) critically endangered species native to Panama, San Diego Zoo, California

ZSSD / Giant Panda (Ailuropoda melanoleuca) baby, endangered species native to China, San Diego Zoo, California

ZSSD / Sumatran Tiger (Panthera tigris sumatrae) cub, endangered species native to Sumatra, San Diego Zoo Safari Park, California

ZSSD / Moss Frog (Theloderma corticale), native to Vietnam, San Diego Zoo, California

ZSSD / Guyana Caiman Lizard (Dracaena guianensis) baby, San Diego Zoo, California

ZSSD / Sumatran Tiger (Panthera tigris sumatrae) cub, endangered species native to Sumatra, San Diego Zoo Safari Park, California

ZSSD / White Rhinoceros (Ceratotherium simum) portrait showing horns, native to Africa, San Diego Zoo Safari Park, California

ZSSD / Western Lowland Gorilla (Gorilla gorilla gorilla) portrait, critically endangered species native to Africa, San Diego Zoo Safari Park, California