Blue-ringed octopus

Blue-ringed octopuses, comprising the genus Hapalochlaena, are four highly venomous species of octopus that are found in tide pools and coral reefsin the Pacific and Indian oceans, from Japan to Australia.[2] They can be identified by their yellowish skin and characteristic blue and black rings that change color dramatically when the animal is threatened. They eat small animals, including crabs, hermit crabs, shrimp, and other crustaceans.

They are recognized as one of the world's most venomous marine animals.[3] Despite their small size—12 to 20 cm (5 to 8 in)—and relatively docile nature, they are dangerous to humans if provoked and handled because of their venom, which contains the powerful neurotoxin tetrodotoxin.

The species tend to have a lifespan of approximately two years. This can vary depending on factors such as nutrition, temperature and the intensity of light in its habitat.