- Jellyfish is the common name for the invertebrate animals making up two classes of the coelenterate phylum.
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- The most dangerous is the box jellyfish which swims near northern Australia and southern Asia. A person who is badly stung by one of these can die in four minutes.
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- Jellyfish are slow movers, so they rely on their nasty stings to keep them safe.
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- Jellyfish don't have brains or refined sense organs such as eys or ears.
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- The term jellyfish applies specifically to the free-swimming, gelatinous organism called the medusa, the form usually taken during the sexual stage of these animals.
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- Large jellyfish are up to 2 m (6.6 ft) wide.
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