UK: 5th episode of Blue Planet II starts 8pm Sunday BBC One. Nordics and Asia : simulcasting on BBC Earth. USA: Early 2018 on BBC America. Details here www.bbcearth.com/blueplanet2 Subscribe to BBC Earth for more amazing animal videos - bit.ly/BBCEarthSub *Army Of Spider Crabs Shed Their Shells* In this Blue Planet II episode clip we witness hundreds of thousands of Spider crabs coming together to shed their hard unexpandable shells and emerging with larger new shells, which takes a few days to harden. Watch more videos from BBC Earth: Planet Earth bit.ly/PlanetEarthPlaylist Blue Planet bit.ly/BluePlanetPlaylist Planet Earth II bit.ly/PlanetEarthIIPlaylist Planet Dinosaur bit.ly/PlanetDinoPlaylist Check out the other two channels in our BBC Earth network: BBC Earth Unplugged: bit.ly/BBCEarthUnplugged BBC Earth Lab: bit.ly/BBCEarthLabYouTubeChannel About BBC Earth: The world is an amazing place full of stories, beauty and natural wonder. Explore the official BBC Earth YouTube channel and meet the animals and wildlife of your planet. Here you'll find 50 years worth of astounding, entertaining, thought-provoking and educational natural history documentaries. Dramatic, rare and wild nature doesn't get more exciting than this. Subscribe to be the first to view new animal documentary videos. You can also become part of the BBC Earth community on Facebook, Twitter and Instagram. Here you'll find the best natural history content from the web, exclusive videos and images and a thriving, vibrant community. Want to share your views with the team behind BBC Earth and win prizes? Join our fan panel here: tinyurl.com/YouTube-BBCEarth-FanPanel This is a channel from BBC Worldwide who help fund new BBC programmes.