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"The pain is said to be excruciating and victims may also experience paralysis, difficulty breathing and cardiac arrest..."

This fish looks like an ugly, warty rock and spends much of its time sitting completely motionless. But touching its venomous spines by accident can be lethal ...
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This Fish Doesn’t Chase You—But Step on It, and You Could Die

The reef stonefish (synanceia verrucosa) is camouflaged at the bottom of a tropical aquarium in its natural habitat among rocks, corals and algae with blurred background© Denis ...