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Blue-ringed octopuses are small cephalopod species classified under the genus Hapalochlaena, known among marine creatures for carrying a deadly toxin. Four species have been identified in this genus: Hapalochlaena lunulata, H. maculosa, H. fasciata, and the rare H. nierstraszi. Each is recognized by the characteristic blue rings on their bodies. These rings become prominent when they feel threatened, serving as a warning to predators. Morphology and Behavioral Characteristics The body length of