Description: Blue-ringed octopuses, known for their venomous bite, are found in coastal waters around Australia. These small, but dangerous, creatures are common in rock pools, reefs, and other sheltered areas. While they are not aggressive, they will bite in self-defense if provoked or handled. Their venom is highly potent, potentially fatal, and causes paralysis. Here's a more detailed look: Key Characteristics: Venomous: Blue-ringed octopuses are one of the most venomous marine animals.