In this episode, Winterwatch looks at wonderful warming winter gatherings. Everyone comes together in the winter – and so do the animals. Chris Packham is live in the New Forest, looking at what’s been happening in the badger sett and at the latest action from the River Ness. Iolo Williams is looking at otters at CAT in Wales and seeing the ways they're encouraging more otters to the site by building them holts. Gillian Burke is at RSPB Old Moor, where they’ve been having some success with managing the eel population. Gillian explores the life-cycle of this fascinating creature. Michaela Strachan is in Tentsmuir in Fife to look at wildcats in Scotland. Megan McCubbin has the second of a four part look at species that aren't as loved as they should be. Megan is swimming with jellyfish in a bid to understand why they are misunderstood. Meanwhile, actor and keen birder Sam West teams up with sound recordist Gary Moore at RSPB Minsmere to better understand the sounds of our winter birds.