Joel Sartore’s goal is ambitious: document 12,000 species in captivity, many of which are endangered like the female white rhinoceros. These images and more can be found in the April issue of National Geographic.
Northern White Rhinoceros at Dvůr Králové Zoo, Czech Republic (Joel Sartore/National Geographic)
Panther Chameleon at the Dallas World Aquarium (Joel Sartore/National Geographic)
Joel Sartore
North American Porcupine at the Great Plains Zoo, South Dakota (Joel Sartore/National Geographic)
Joel Sartore
Schmidt’s Red-tailed Monkey at the Houston Zoo. (Joel Sartore/National Geographic)
Joel Sartore
Curl-crested Aracari at the Dallas World Aquarium. (Joel Sartore/National Geographic)
Joel Sartore
Green Tree Python at the Riverside Discovery Center, Nebraska. (Joel Sartore/National Geographic)
Joel Sartore
Bornean Orangutan and A Bornean/Sumatran Orangutan Cross at the Houston Zoo. (Joel Sartore/National Geographic)
Joel Sartore
Blue-spotted Tree Monitor at the Gladys Porter Zoo, Texas. (Joel Sartore/National Geographic)
Joel Sartore
African White-Bellied Tree Pangolina Baby at Pangolin Conservation in St. Augustine, Florida. (Joel Sartore/National Geographic)
Joel Sartore
Guianan Cock of the Rock at the Dallas World Aquarium. (Joel Sartore/National Geographic)
Joel Sartore
Top row, from left: Waxy Monkey Tree Frog; Hippopotamus; Reimann’s Snake-necked Turtle; Snowy Owl; Malayan Tiger. Bottom row, from left: Brazilian Porcupine; Southern Three-banded Armadillo; Indian Peafowl; Mother and Baby Koalas; Coquerel’s Sifaka. (National Geographic)
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