66. The Blue-Ringed Octopus
Domain: Coral reefs and tide pools in the Indian and Pacific Oceans, especially from Australia to Japan.
The infamous blue-ringed octopus is no larger than eight inches in length but its venom can kill as many as 26 adults in mere minutes. Worst of all, their bite is painless so you’re clueless until symptoms appear. Symptoms include blindness, nausea, heart failure, paralysis, and respiratory depression. There’s no antivenom but it usually flees from divers.
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