Say a few not too cold knowledge points: 1. The umbrella body of the big jellyfish can reach 2 meters in diameter. The edge of the umbrella body has some whisker-like tentacles, and some can reach up to20-30 meters; 2. The jellyfish existed as early as 650 million years ago, and they appeared even earlier than dinosaurs; 3, jellyfish hearing amazing, before the storm can get information more than ten hours; 4, jellyfish color change, and can glow; 5, jellyfish and small herd fish coexist, mutual use, jellyfish "protected" small herd fish, and small herd fish swallowed the small creatures that live on the jellyfish; 6, jellyfish has no brain. Its body is only double layer structure, like in one plastic bag (cortex) put another plastic bag (stomach layer), and the middle of the two layers is glued by the wedge-like glue (mid glue layer). But this ghostly appearance, persisted for hundreds of millions of years...