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Pufferfish
A couple of creature assortments live in new/saline water. The pufferfish is harmful to the point that it’s assessed the second poisonous creatures found on the planet. Their poison has tetrodotoxin; that is on various occasions more perilous as that of cyanide. This poison substance found in eyes, liver, kidneys, ovaries, spikes of these fishes. No neutralizing for puffer fish toxin and they will kill an adult human in part of seconds or minutes.