The Irukandji Jellyfish (Carukia barnesi) inhabits waters of Australia. This is a deadly jellyfish, which is only 2.5 centimeters (with bell and tentacles) in diameter, which makes it difficult to spot. This jellyfish is believed to be the most venomous creature in the world. The term Irukandji refers to an Australian tribe that inhabited the Palm Cove region of northern Queensland where the Irukandji syndrome, caused by the jellyfish stings, occurs most often. This is a species of jellyfish that has been known about in recent years, due to deaths of swimmers in Australia. This species of deadly jellyfish is related to another deadly jellyfish, the Box Jellyfish. The jellyfish itself was identified in 1964 by Dr. Jack Barnes. The Irukandji has stingers not only on its tentacles but also on its bell. This jellyfish is very small and fragile; it cannot be kept in a normal aquarium because if they hit the side the impact will kill it.