Some of the orangutans rescued from the illegal pet trade and human/wildlife conflict will never return to the wild.

Some were shot, others taken when their mothers were killed during deforestation or human-wildlife conflict. Some survive these attacks — but not without permanent damage. At Orangutan Haven in Sumatra, a few of the residents are completely blind, but conservationists like Ian Singleton are trying to give them a second lease on life.

That creates a challenge most people never think about: how do you give an animal a meaningful quality of life when it can’t see the world around it?

Conservationists are experimenting with scent scents and sounds, and even systems that would allow the orangutans to choose whether they want music playing.

There are fewer than 120,000 orangutans left in the wild, and every one rescued from the pet trade carries a story about what’s happening to the forests they once called home.

What would you do to enrich the lives of blind orangutans? And what conservation stories do you want to hear about next?