Chris Skinner starts this episode by capturing the song of a nearby Blackcap Warbler.Matthew Gudgin arrives at High Ash Farm and the pair observe the corkscrew flight of Rooks at what is the riskiest time of the year for the bird. Rat comes along for the ride in this episode and takes umbrage to dog walkers on the farm. Chris dons his wellies to show Matthew some of the stream inhabitants who only live in the freshest of waters.In the thirty years that Matthew has been visiting High Ash Farm ...