How much toxic does a jellyfish have?

The toxicity of a jellyfish varies significantly among species. Some, like the box jellyfish, possess venom potent enough to cause severe pain or even death in humans, while others have minimal or no harmful effects. The amount of toxin can also depend on the size and health of the jellyfish and the specific circumstances of the sting. In general, the venom is used primarily for hunting prey and defense.