Octopuses have gotten a reputation for being cunning camouflagers and intelligent creatures. But some are known for a more ominous reason: They’re deadly. One group — the blue-ringed octopus (genus Hapalochlaena) — is especially dangerous. But what makes this creature so lethal? Blue-ringed octopuses carry a killer concoction called tetrodotoxin (TTX), a potent neurotoxin that can paralyze living things, including …
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