Imagine that animals that have no brain and consist of 95% water can easily kill a human. Yes, it's actually scary. It’s known that most of them have special cells called nematocysts, which release toxins really fast. We want to tell you about the most dangerous jellyfish in the world.

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1. The Sea nettle (Chrysaora). This jellyfish is common in North America. Many of these jellyfish form in a huge flower. Each of them has 24 tentacles with a length up to two meters. The main weapon of sea nettle is stinging cells.