40 Australian Creatures You Never Thought Existed

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Box Jellyfish (Cubozoa)

Image: Box Jellyfish Org

Though it might look like a psychedelic dream, this translucent wonder is the also most venomous sea creature in existence. Death by box jellyfish is quick and violently painful as the venom acts quickly to stop the heart and restrict breathing. Many victims die before reaching the shore.

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