They can live in the polyp, or budding, stage for as long as 5 years or more. During the medusa stage the jellyfish may live for several months. A jelly can regenerate small amounts of tissue that has been damaged. Australia's box jelly has a lethal toxin more potent than cobra venom and can kill a person in minutes. The largest jellyfish has a bell that can reach 2.4 metres across and tentacles that extend over half the length of a football field.
Many people consider jellies a delicacy.
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