There are about two thousand known species of jellyfish around the world, although it's believed there are probably at least another thousand of these creatures yet to be discovered and named. Some have painful stingers, but others are totally harmless. Jellyfish have no heart, brain, eyes or bones. They are 95% water.
Some jellyfish are so tiny that they are almost invisible. The smallest (Staurocladia and Eleutheria) are about half a millimetre (one fiftieth of an inch) wide. The largest known jellyfish is the Nomura's jellyfish, which weighs about 200kg (440lb) and has a diameter of 2 metres (or 6 and a half feet).
Music is by Aakash Gandhi, "Frozen in Love".
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