Deep Look | Have You Met a Hagfish? It’s About Slime. | Season 10 | Episode 1 | PBS

What keeps the boneless, jawless hagfish thriving after more than 300 million years? SLIME. The goop it exudes – a mix of mucus and special protein cells – expands to 10,000 times its original volume in less than half a second, potentially clogging the gills of competitors.