Matt Baker and Anita Rani are at the stunning Montrose Basin in Angus in Scotland. The basin is a natural, almost circular, inland sea that is an internationally important site for wild fowl. Anita helps warden Anna Cheshire conduct one of the regular bird counts and gets stuck in helping make special nesting tubes for the basin's ducks. She also discovers how treacherous the mud flats can be as she ventures out with one of only three specialist mud rescue teams in the whole of Scotland. Matt, meanwhile, finds out that the soft sands made the basin the perfect place for the UK's first airbase. Matt sees remnants of the runway next to the dunes and meets the enthusiasts building a replica of a one of the First World War's most famous planes, the Sopwith camel. He also meets a farmer-turned-rugby coach to play rugby with a difference: no running! Walking rugby is one of the fastest growing sports in the country, great for people of all ages and especially for those recovering from injuries. Just a few miles from the basin, Naomi Wilkinson is taking a trip up the stunning Glenesk, looking for wildlife with gamekeeper Andy Malcolm. And as spring returns to the slopes of this beautiful glen, there's all manner of wildlife awakening after the winter slumber. If she's in luck that could mean golden eagles! Also in this programme, Adam calls in a dog psychologist to find out which of his working dogs, Boo or Peg, is the smartest. Tom Heap investigates what the EU referendum could mean for our countryside. This week he grills the prime minister and Boris Johnson on how they think it will affect the environment and our fisheries.