Steve Brown is on the trail of an elusive and endangered Scottish creature - the mud snail. They may not be one of nature's glamour species, but these tiny molluscs play an important role in the ecosystem. Anita Rani cycles along the sands of the East Lothian coast on a 'fat bike'. With larger than normal tyres they leave virtually no trace in the sand, having as little impact on the natural habitat as possible. Matt Baker visits St Abbs - a community who refused to let their lifeboat service go under. When threatened with closure they independently took on the community lifeboat, saving 104 years of history. There are ten million cattle farmed in the UK, and it is a well-known fact that livestock like cows produce a lot of methane, which contributes to global warming. Adam Henson is in Edinburgh at an agricultural college where they are working on a solution. Tom Heap looks at companies buying up swathes of countryside and selling it on with planning permission for houses.