Matt Baker and Anita Rani are in Anglesey, where Matt is on the lookout for harbour porpoises. He meets scientist Peter Evans to find out why the waters round Anglesey are so good for a whole variety of marine mammals. He also meets the schoolchildren who've made it their mission to keep the islands beaches clear of plastic. Anita meets 'squirrel whisperer' David Lacey, a man who has red squirrels literally eating out of his hands. Anita then heads out with fisherman John Jones to find out what's behind the boom in Menai mussels. Tom is looking at faux fur and asks how do we know it isn't real. And Adam finds out how the latest facial recognition technology is helping farmers spot problems early with their livestock. When is faux fur not fake? Well, more often than you'd think. Helen Skelton is investigating how real fur is making it into our shops and our wardrobes without us realising.