What is deadlier a irukandji or a blue ringed octopus?

Both the Irukandji jellyfish and the blue-ringed octopus are highly venomous and can be deadly to humans. The Irukandji jellyfish, though small, can cause severe symptoms known as Irukandji syndrome, which can lead to death in rare cases. The blue-ringed octopus, while also small, carries enough venom to cause paralysis and respiratory failure, often resulting in death if medical attention is not received promptly. Overall, both are extremely dangerous, but the blue-ringed octopus is often considered more immediately lethal due to the rapid onset of its effects.