Blue ring octopus

A Blue Ring Octopus is pictured at Oceanworld Aquarium January 24, 2006 in Sydney, Australia. This Octopus has venom called cephalotoxin, and is composed from enzymes in the salivary gland in its mouth. The venom is a neuromuscular paralysing toxin, where nerve conduction in the victim is blocked, followed by paralysis, then death if no medical treatment is sought.