Blue-ringed Octopus

Blue-ringed octopuses are small cephalopods that use reefs, rubble, shallow coastal habitats and other shelters, depending on the species. Their blue markings can become strongly visible against the body when they are alarmed. Crustaceans and other small animals provide food. Their bite contains potent venom, making their small size a poor guide to the risk they can pose. The common name covers several closely related octopuses rather than one identical form everywhere.