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Box Jellyfish

Photo: Box jellyfish
The tentacles of a box jellyfish (Chironex fleckeri) trail behind it and can reach 15 feet (4.6 meters) in length. Found in northern Australia and adjacent waters, a sting from this species can be deadly. This species of box jellyfish, the largest, can have as many as 60 tentacles.
Photograph by David Doubilet

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Guides by National Geographic photographers.