This is a Southern blue-ringed octopus. They are found in tidal rock pools along the south coast of Australia. They are venomous with venom that can kill humans. They eat lobsters, crabs,
Blue Ringed Octopus - Animal Corner
Blue Ringed Octopus: The most deadliest octopus
More potent than cyanide': how to stay safe from blue-ringed octopus - Australian Geographic
My Blue Ringed Octopus Encounter – Life is too short to drink bad wine
More potent than cyanide': how to stay safe from blue-ringed octopus - Australian Geographic
Blue-ringed Octopus - Museums Victoria
Southern Blue-ringed Octopus | NatureRules1 Wiki | Fandom