Bobbit Worm: Supposedly named after Lorena Bobbit (the lady who cut off her husbands dick ).
Can grow to 10' in length, has toxins on its skin that can cause humans who come in contact with it to be permanently numb with whatever body part touched it. Has the bite strength to chew through Coral and Human bone.
The link below shows it catching a large Lion Fish, taking it underground like some freaking nightmare
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Really interesting TED animation:
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That's the first thing I thought of when I saw it