Springwatch returns for a second live week of wildlife stories from across the country. Tonight, the team explore the power of nature on mental health. Chris Packham shares an extraordinary story of how a love of birds united British POWs and German officers during World War II. The team follow the fortunes of a pair of choughs in west Wales, and wildlife presenter and cameraman Gordon Buchanan focuses on Scottish ospreys in Loch Lomond National Park.