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The Cassiopea isn't just normal jellyfish - they are solar powered, photosynthetic jellyfish, thanks to the symbiotic algae that live on them. Subscribe: Watch more videos from BBC Earth: Planet Earth Blue Planet Planet Earth II Planet Dinosaur Atlantic: Wildest Ocean on Earth Discover the mysteries of the Atlantic ocean in all its moods, from its darkest depths to its coastline and islands, and learn about the people and wildlife whose lives are shaped by its rhythms. This beautiful and dramatic series takes viewers on a mind-blowing journey from north to south, from Africa to Brazil.
