Hagfishes (Myxinidae) are hermaphrodites and almost blind, so they compensate their weak sight with other sensory receptors. Their metabolism is very slow, they can survive 7 months without food, and they spend most of their time buried in mud. In territory of Europe hagfishes are widespread especially in the Norwegian fjords. They have a lot of slime glands. The main function of slime glands is to produce huge amounts of the slime that serve as a defence system. When slime connects with water it automatically becomes sticky and dense. Proteins give strength and structure to the slime and have a length of 15 cm and diameter of 1-3 μm. Predators that attack the hagfish can very easily suffocate in its slime and mucus because it clogs their gills, but this defence system of hagfishes can also suffocate the hagfish itself. However, hagfishes have developed a method to get rid of their own slime if they get trapped. Recent studies have shown that the hagfish slime is biomaterial of the future.