Blue-ringed Octopus: Tiny, Dazzling… and Among the Ocean’s Deadliest

Quick factsAbout golf-ball sized (some even coin-sized), yet packs tetrodotoxin (TTX)—a nerve poison ~1,000× stronger than cyanide.When stressed, its skin flashes electric blue rings/lines as a high-contrast warning.Lives in shallow reefs, tide pools, and sand–silt flats across the Indo-Pacific (...