I'll start with this one; it's why you can't swim off the coastal beaches in North Queensland in summer. Please Register or Log in to view the hidden image! The Box Jellyfish is also known as the 'Sea Wasp' s a dangerous creature that inhabits Australian waters. This Jellyfish has some of the most extreme toxins in the world present on its tentacles, which when in contact with a human, can stop cardio-respiratory functions in as little as three minutes. The box jellyfish is responsible for more deaths in Australia than Snakes, Sharks and Salt Water Crocodiles. The creature has a square body and inhabits the northeastern areas of Australia. The tentacles may reach up to 80 cms in length. It is found along the coast of the Great Barrier Reef.