This time Chris looks at coastal animals. Chris investigates why the waters and coastlines of the UK are the most popular places in the world for two of our coastal species: the grey seal and the Manx shearwater. He also makes a stand for an animal that he considers much misunderstood - the British gull. And he meets two animals which have truly extraordinary ways of sensing Britain's coastal environments - the shore crab which finds its way around by smelling through its feet; and the bottlenose dolphin which can identify a fish at 200 paces in the pitch black, using echolocation.