Many sea creatures are fierce or poisonous, making them dangerous. Killer whales are big and aggressive, which make them deadly and so are the tiger and hammerhead sharks. The great white shark has lethal bite. Some small creatures have poisons that make them just as dangerous. The most poisonous of these are the jellyfish, the stonefish, and the blue ringed octopus. Contact with them leads to quick and painful death.
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