The poison. The Blue-ringed octopus is the most poisonous animal in the sea: "Its venom is 1,000 times more powerful than cyanide, and [it] packs enough venom to kill 26 humans within minutes". So if it bites you, you're in real trouble.Because of underwater? Or is the poison itself so lethal?
It is one of the most lethally poisonous creatures on the planet but quite docile, and will only attack if provoked or scared and in self-defence. Unlike anything Australian that'll do it for sport. We'll have to wait for @Mole HD to comment on zombie cows.
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