Chris Packham and Kate Humble are in north Norfolk to witness one of the most spectacular autumn phenomena. The 'knot spectacle', 40,000 wading birds flying in formation, is a truly unforgettable wildlife event. Meanwhile, Simon King reports live from the Forest of Dean, unearthing yet more surprising autumn stories as well as unveiling the final chapter of the red deer rut. Gordon Buchanan concludes his North Sea quest for killer whales and Martin Hughes-Games shows how to get more involved with wildlife.