Box jellyfish are cnidarian invertebrates distinguished by their box-like body. Some species of box jellyfish produce potent venom delivered by contact with their tentacles. Box jellyfish, named for their body shape, have tentacles covered in biological booby traps known as nematocysts - tiny darts loaded with poison. People and animals unfortunate enough to be injected with this poison may experience paralysis, cardiac arrest, and even death, all within a few minutes of being stung. Severe box jellyfish stings can be fatal, triggering cardiac arrest in your body within minutes. Less severe stings may only cause symptoms like pain and irritated red tracks along your body, but they may not be deadly. Believe it or not, a tiny little jellyfish takes the title for the most venomous creature on Earth! Just getting part of a tentacle on your skin is enough to kill a person within 2 minutes. We know this deadly creature as the box jellyfish. Queensland teenager dies from box jellyfish sting in first fatality from the animal in 15 years. A teenager has died a week after being stung by a box jellyfish while swimming at a beach on Queensland's western Cape York. It is the first recorded fatality from a box jellyfish sting in Australia in 15 years. Due to its toxic venom, the box jellyfish has very few predators. However, some species of sea turtles are immune to this venom. They can eat the jellies without worrying about the effects of the stinging tentacles. Green sea turtles in particular are the major predator of the box jelly. Box jellyfish prefer to live in groups as well as alone across box jellyfish habitats. A group of box jellyfish is known as a smack. The box jellyfish will live up to 3 months, but can survive up to seven or eight months in a science lab tank. Scientists have described the oldest definitive jellyfish ever found, using recently discovered "fossil snapshots" found in rocks more than 500 million years old. The jellyfish are unique because they push the known occurrence of jellyfish back from 300 million to 505 million years.

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