The world’s lemurs are going extinct. This is the only way to save them.

A group of ring-tailed lemurs just waking up in a tree near the village of Ifanato in southwest Madagascar. On a cloudless morning in September, sunlight poured through the canopy of a banyan tree near the banks of the Onilahy River, which runs from southwest Madagascar to the Indian Ocean. The tree grew on the edge of a small karst cliff. Its roots spilled over the side like melting candle wax.  I scrambled up the cliff for a better view of the canopy, when I saw something staring back at me: a lemur. It had scruffy white fur, a black face with bug-eyes, and a tail that was at least