Q: Will the Photo Ark ever be complete? Joel: Yes, we are halfway done after 11 years with 6,500 species. Because we’ll now have to travel farther and wider to get the remaining species ...

This story features photos from the National Geographic Photo Ark. Buy Photo Ark books and merchandise here. This story appears in the February 2017 issue of National Geographic magazine.

He’s here to photograph creatures found nowhere else on the planet, and add them to his Photo Ark. Joel’s main goal is to photograph a lemur, the rare and acrobatic Decken’s sifaka.

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For Photo Ark, Sartore has immortalized all living creatures, both big and small—from mussels and beetles, to seals and elephants—in more than fifty countries. He won’t stop, he says ...