National Geographic has started an ambitious project to document all 12,000 species in captivity - many of which are endangered. The Photo Ark project is led by photographer Joel Sartore, whose portraits of wildlife worth saving have been projected around the world on landmarks like
A Bornean orang-utan and a Bornean/Sumatran orang-utan cross at the Houston Zoo. Photo / Joel Sartore for National Geographic
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