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Jelly Fish Facts

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Jellyfish have lived in the waters of the world for more than 650 million years, long before the dinosaurs, making them the oldest multi-organ animal.

The upside-down jellyfish does not float in the water. Instead, it anchors itself to the ocean floor, with its short arms and tentacles reaching up. It looks like a bowl of plants rather than a typical jellyfish.

There are more than 2,000 different types of jellyfish. Approximately 70 can hurt people, with the box jellyfish (Chironex fleckeri) being the most dangerous. Scientists believe that there could be as many as 300,000 different species of jellyfish yet to be discovered.

Jellyfish are not fish. They are actually plankton from the phylum Cnidaria (Greek for “stinging nettle”) and the class Scyphoza (from the Greek “cup”). Some aquariums are trying to popularize the terms “jellies” or “sea jellies” instead of jellyfish.

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