Shea butter, a rich silky fat loved for its versatility, is under threat. It’s a key ingredient in everything from moisturisers to pharmaceuticals, and it has a huge global market. The shea trees where it’s extracted from grow from West to East Africa in a vast strip known as the "shea belt".

BBC Africa’s Anne Okumu has been to visit the Mount Kei Central Forest Reserve in Uganda, an area which used to be lush with wild shea trees, but has now been turned into a near-barren expanse dotted with stumps. She tells us why people have been cutting them down, and what this has to do with climate change. We also hear about what is being done to protect shea trees.

Instagram: @bbcwhatintheworldEmail: [email protected]: +44 0330 12 33 22 6Presenter: Iqra FarooqProducers: Mora Morrison, Adam Chowdhury and Benita BardenEditor: Verity Wilde

Axolotls are only found in the wild in one place in the world; an area of wetland just outside Mexico City. They are one of the world’s most endangered, and arguably most adorable, amphibians. Not just meme-worthy, they are also scientifically fascinating - they don’t really age and they can regrow body parts, including their brains. Very few are left in the wild, but now scientists have released captive-bred axolotls back into the wetlands and found that they not only survived, but even put on a bit of weight. BBC science correspondent Victoria Gill talks us through the study and explains what scientists can learn from these amazing creatures. And Assistant Professor Prayag Murawala from the MDI Biological Laboratory in the US, describes what we know about how axolotls regenerate their own body parts. Instagram: @bbcwhatintheworldEmail: [email protected]: +44 330 12 33 22 6Presenter: Hannah GelbartProducers: Chelsea Coates, Emily Horler and Julia Ross-Roy Editor: Harriet Oliver