In a celebration of wildlife in Britain's cities, Megan McCubbin heads into Glasgow to revel in its urban cast of characters, while Iolo Williams visits a nature reserve in the heart of Weymouth. Chris Packham and Michaela Strachan catch up on the weekend drama from the live cameras at RSPB Arne in Dorset, and they set graffiti artist ATM off on a mission to leave a wildlife mark on a once-white wall. He has the week to complete it, with a reveal of his finished masterpiece on the final show.