Octopuses have 2 eyes and 4 pairs of arms and are bilaterally symmetric. An octopus has a hard beak, with its mouth at the center point of the arms. Octopus lack an internal or external skeleton allowing them to squeeze through tight places. Octopuses are among the most intelligent and behaviorally flexible of all invertebrates. Blue Ring Octopus
The blue-ringed octopus. This admittedly cool-looking creature is known to hide out in the tiny rock crevices of Australian tide pools and is responsible for more than 20 recorded deaths–mostly of young children who didn’t know any better. Perhaps most frightening is that there is no known anti-venom for its powerful poison. Death generally occurs within two hours.
Blue-ringed octopus - three (or perhaps four) octopus species that live in tide pools and coral reefs in the Pacific and Indian Oceans, from Japan to Australia (mainly around southern New South Wales and South Australia). They are recognized as one of the world's most venomous marine animals