The Jawless Ocean Survivor That Defeats Sharks With Slime (Hagfish)

Added: 2026-05-05

The hagfish, a jawless, boneless scavenger living on deep-sea seafloors between 100-1,000 meters depth, possesses a remarkable defense mechanism where it releases mucus from up to 200 glands across its body; this mucus expands into a dense fibrous gel with fibers 100 times thinner than human hair and tensile strength comparable to nylon, clogging predators' gills and causing them to suffocate or retreat, a defense so effective that the US Navy studied its fiber structure for ballistic materials.