I learned about hagfish in my vertebrate zoology courses. Basically, hagfish are mysterious jawless fishes that live in the ocean. Despite being classified as vertebrates by many zoologists, they lack vertebrae, thus they are considered to be very primitive fishes. When threatened, hagfish secrete a mucus that forms threadlike fibers similar to spider’s silk. When mixed with water, a small amount of this mucus can tranform itself into an astonishingly huge slimeball, as seen in the video below the fold. It has been observed that hagfishes use this slime as a self-defense mechanism. After danger has disappeared, they rid their bodies of this slime by tying themselves into a knot. The knot travels from their head to their tail, ridding their body of the slimeball.