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The spiky creature in this coral reef scene is a Pufferfish, specifically a Spiny Pufferfish or Porcupinefish (Diodon holocanthus).… The spiky creature in this coral reef scene is a Pufferfish, specifically a Spiny Pufferfish or Porcupinefish (Diodon holocanthus). My decades of marine biology experience have taught me to respect the unique and highly effective defense mechanisms of these fascinating fish. While normally appearing smooth, its body is covered in retractable spines that stand out when the fish inflates itself with water or air. The Porcupinefish's primary defense, aside from its spines, is its internal toxicity. Its organs contain a potent neurotoxin called tetrodotoxin, making it highly poisonous to most predators. This fish's large, round eyes and powerful, beak-like mouth—perfect for crushing the shells of its prey like crabs and mollusks—are also characteristic features. They are found in tropical waters worldwide, often hiding among the crevices of reefs and rocks.