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Chris Packham and Michaela Strachan visit Spurn Point on the Humber Estuary to witness one of autumn's biggest events, migration. They'll be tracking our winter visitors like redwings and fieldfares as they arrive, and there's also an update on the Springwatch ospreys as they head south for the winter. Martin Hughes-Games reveals unique insights into the lives of badgers with the help of special cameras installed deep within a sett . And in Scotland, wildlife cameraman Charlie Hamilton James is following the epic journey of the salmon, from the sea to their spawning grounds.