Chris Packham, Michaela Strachan, Gillian Burke and Iolo Williams focus on the incredible journeys wildlife makes in autumn, whether feather, fin or fur. Megan catches up with some rare whales in the Scottish Highlands, Iolo reveals the super science behind nocturnal mass migration, Chris and Megan light up the New Forest to visualise secret fungal networks, and Gillian reveals that ducks support their own team colours!