Blue-ringed Octopuses

Blue-ringed octopuses, comprising the genus Hapalochlaena, are four highly venomous species of octopus that are found in tide pools and coral reefs in the Pacific and Indian Oceans, from Japan to Australia. They can be identified by their yellowish skin and characteristic blue and black rings that change color dramatically when threatened. They eat small animals, including crabs, hermit crabs, shrimp, and other crustaceans.