According to a story posted on National Geographic News, an Australian study found evidence that "all octopuses, cuttlefish, and some squid are venomous." The venom helps corrode shells and weaken the prey of these cephalopods.
However, while all octopuses appear to be poisonous, only the blue-ringed octopus is dangerous to humans. Seems these tiny little creatures can kill you rather quickly if they bite you or if you try to bite them for dinner.
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