SYDNEY, NSW – JANUARY 24: 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. Often the bite is painless, and therefore goes unnoticed. The Blue Ring Octopus is so named because of its iridescent blue rings, indicating its deadly nature to predators. Australia is home to some of the most deadly and poisonous animals on earth. (Photo by Ian Waldie/Getty Images)
