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  • While this is really entertainingly written, the hagfish actually isn’t a parasite, like a vulture, it attacks the dead and dying, or it preys on tinier animals alive 🙂

    • Thanks Jonathan – I confirmed this tip and revised the list.

      Oh, and by the way, don’t forget to celebrate Hagfish Day on October 20th – a celebration of combination of creatures who are “unusual, endangered, and beauty challenged” (

      • Hagfish day? I should do something special for my site! 😀

  • diana

    omg – so if hagfish slime gets inside of you (apart from the screaming and agony once it’s eating you from inside) does it mean your bodily fluids coagulate and solidify?! O..M..G…!!!

    • Fortunately, no recorded attacks on humans yet since hagfish usually dwell in deep, cold waters, and are mostly attracted to dead rotting things or nearly dead sickly things, but swarms of them can reduce a whale corpse to bare bones! They’re like the sea’s maggots, the top consumers of the dead.

      If you were trapped in a tank of them naked and they got hungry enough, though, I doubt they would be picky…

  • Ted

    The “teeth” on the Promachoteuthis Sulcus squid (#7) are actually circular lips, and the beak is inside. Reference here:

    But I admit, that is one freaky feature!

  • Stacked Stone Bloke

    what’s with number 7. The thing looks like it’s got a bloody human mouth!

  • Chris M

    This is a nice list but I study zoology and I specialize in Ichthyology, and you have a couple problems with your list. The true definition of deep-sea is below the thermocline, at around 1,800 meters or below. 1, there is only one species of the 70 species of hagfish that is deep sea and that is the Atlantic Hagfish and the video does not appear to be an Atlantic Hagfish. 2, Tiburonia granrojo has only been found at it’s deepest distance down at 1,500m down, exempting it from be considered a deep-sea creature. 3, the Snakehead is not a sea fish at all, it’s completely freshwater. I actually had to look up Promachoteuthis sulcus, I’ve never heard of it before but it is a deep-sea squid but only one has ever been found. 4, there are 50 species of stargazers worldwide and they are all found in shallow coastal waters. Lastly, the Blue-ringed Octopus is not deep-sea either, it’s found on the costal regions of Australia all the way up to Japan. I love these guys, they are considered the most venomous animal in the world and the second most deadliest animal in the world. Thanks,
    Chris M

    • David Dietle

      Nowhere does it say any of these are deep sea creatures; “Of the deep” is a common metaphorical way of saying “of the seas.”

      And the blue ringed octopus is overshadowed by the box jellyfish in terms of being venomous. However, the snakehead is not a saltwater fish. At least one of your corrections was correct.