Box Jellyfish

Box Jellyfish (Chironex fleckeri) are named for their box-like shape. From each corner of the body hang numerous tentacles, that contain thousands of minute stinging cells called nematocysts. These are so tiny that 1000 would fit on the head of a pin. Nematocysts contain a hollow thread that can spring out, pierce the skin of the prey, and inject venom. The venom is used to kill the small fish and prawns that the jellyfish feeds upon. The venom also affects humans, and large stings can cause serious injuries or even death. Box Jellyfish are common along the northern Australian coast between October and May.