Hagfish are an eel-like sea creatures with the ability to excrete a teaspoon of slime that almost instantly expands to 10,000 times the volume. The slime, a combination of mucous and protein threads, is magical, too! Surprise, it’s not sticky, and it’s actually incredibly soft. Think about the softest thing you can think of. WRONG, this is softer. Hagfish slime is so soft, scientists had to create new ways to measure it when traditional instruments couldn’t hack it.
The proteins threads that give the slime cohesion are incredible in their own right. Each is one-100th the width of a human hair, but can stretch for four to six inches. And within the slime glands, each thread is coiled like a ball of yarn within its own tiny cell — a feat akin to stuffing a kilometer of Christmas lights into a shoebox without a single knot or tangle. No one knows how the hagfish achieves this miracle of packaging, but Fudge just got a grant to test one idea. He thinks that the thread cells use their nuclei — the DNA-containing structures at their core — like a spindle, turning them to wind the growing protein threads into a single continuous loop.
But that’s not all! Hagfish don’t have a jawbone, they’ve got kind of a sandpaper on their face, which is not the scientific way to describe it at all. They eat by burrowing into carcasses and rub their face around to get their fill. The skin of a hagfish is more efficient at processing nutrients than their intestines, so needless to say the burrowing really works for them. While hagfish use their slime to defend against attacks — the excreted slime clogs the gills of attackers — they also use their ridiculously squishy bodies as a defense. If a shark bites them, the important bits squish out of the way like one of those water wiggly toys. (Do you know how hard it is is to google the name of a toy you’ve played with your entire life without ever having known the name of? “Squishy squiggly water snake” is what worked for me.) Lastly, hagfish tie themselves in knots to rid themselves of slime AND to help them eat when they’re inside the dead bodies of recently passed sea friends. Now you know.
As a hagfish cleanser, sea otters hold hands while they’re sleeping so they don’t drift apart.
(Allow me an aside. The last time I wrote about the wacky world of sea creatures on Kottke.org, it was a post about the first known case of the sperm of cooked squid implanting in someone’s mouth. (At the time, of course, everyone knew the sperm of raw squid could implant, but this first case of cooked squid doing the same was big news).)
Source: Let’s Talk About Hagfish and Their Wondrously Soft Slime