Blue-ringed octopus, also known as blue-ringed octopus, leopard octopus, is a small but highly toxic marine organism, belonging to the blue-ringed octopus family. Widely distributed in the Pacific Ocean between Japan and Australia, it usually inhabits shallow water intertidal zones, such as coral reefs, seagrass beds, and gravel areas. The body is small, the body surface is usually dark brown or tan, and its most prominent feature is the bright blue ring pattern around the eye spot. In the event of danger will emit a dazzling blue light, as a warning signal. It is a nocturnal animal that usually hides under reefs during the day and comes out to move and feed at night, feeding mainly on crabs and bivalve mollusks.