This episode provided an excellent insight into how close wildlife can be to cities and motorways. black necked grebes at Woolston Eyes nature reserve, right next to the M6 motorway, peregrine falcons nesting on buildings in Birkenhead, and sponges and Korean sea squirts in the docklands (no sign of Richard or Judy). The ash cliffs created by Fiddler's Ferry power station are home to sand martins, and old clay pits support great crested grebes. Oddie explains how Oxford ragwort has made its way to a wall in Liverpool from Mount Etna (via the Oxford Botanical Gardens). When he saw 'evidence' of ravens on one of Liverpool Cathedral's statues, he joked, with a nod to The Fast Show, This week I be mosely wearin' Raven poo. Due to its location this episode gave the excuse to play the Beatles and the Kinks, rather than the usual soundtrack.