 Our environment correspondent, Jonah Fisher, has just come back from the latest expedition and joins us now. Good morning to you, Jonah, and welcome to the program. Good morning, Victoria. Tell us about Mabu. How can it only have been discovered 20 years ago? Well, obviously, the people who live around Mount Mabu in Mozambique have known about it for a very long time. They've been using it for shelter during war. They've been getting wood there. They've been even hunting in the forest.