Research shows that many mammal species are in rapid decline, with drought seen as the biggest cause.
Tribal healers all over the world have used knowledge of plants to treat medical problems for generations.
They might not have the science to explain why the plants work, but they have the experience.
The government in Botswana is trying to record all that is known about traditional tribal medicine, before it vanishes for good.
Al Jazeera’s Peter Greste has been finding out more in Gaborone.