In this Blue Planet II episode clip we witness hundreds of thousands of Spider crabs come together to shed their hard unexpandable shells and emerging with larger new shells, which takes a few days to harden.
They crabs then try to escape being eaten! Check out more videos on the BBC Earth YouTube channel and subscribe!
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.