Blue-Ringed Octopus (Hapalochlaena lunulata): Small and striking with vivid blue rings, this octopus inhabits tide pools and coral reefs across the Pacific and Indian Oceans. It carries tetrodotoxin, a powerful neurotoxin also found in pufferfish. When threatened, it flashes its iridescent rings as a warning before biting. The bite is painless, but the venom rapidly causes paralysis, respiratory failure, and death if untreated. There is no antivenom; victims require artificial respiration until the toxin wears off. Despite its danger, the blue-ringed octopus is shy and non-aggressive, biting only when provoked, making it a rare but lethal encounter.
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