A genus of marine fish commonly called porcupinefish or spiny pufferfish, known for their ability to inflate their bodies with spines.
From Greek 'di-' (two) and 'odont' (tooth), describing the fish's distinctive two large beak-like teeth used for crushing shells and corals, which are fused from multiple smaller teeth.
Diodon fish contain tetrodotoxin, one of the deadliest poisons on Earth—it's 1,200 times more lethal than cyanide—yet some cultures still eat them; this same toxin is also used by researchers to study how nerves work.
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