Blue-ringed octopuses can inject the neurotoxin tetrodotoxin with their bite. This toxin, 1,000 times more potent than sodium cyanide, blocks nerve signals in the body, causing muscle paralysis. Victims of envenomation usually succumb to respiratory failure, as the diaphragm fails to function. There is no known antivenom for this toxin, but timely respiratory support can help save lives. Three people have reportedly died from blue-ringed octopus toxin as of 2026. However, these animals are not aggressive by nature and do not attack humans unless provoked.
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