 Mabu is a forest perched on top of a mountain. That means that many of its inhabitants have evolved in isolation. Expeditions have found new species of chameleon, snake, bats and butterfly. And on our recent trip, we saw possible discoveries of fish and dung beetle too. The Mozambique authorities are now taking action. They told the BBC that Mabu would be turned into a conservation area, which allows the local community to use it for firewood,