As Photo Ark turns 20, Joel Sartore photographs 18,000 animal species

For 20 years, Joel Sartore has been on a quest: to photograph every animal species in human care, and then some.

This year, on the 20th anniversary of the Photo Ark somewhere in Australia, Sartore photographed the project’s 18,000th animal.

He’s not totally sure which one pushed the project over the threshold, but gives it […]