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In humans, mucus serves the important purpose of keeping tissues moist while also acting as a filter to trap harmful particles like allergens and microorganisms before they cause illness. Meanwhile, nature has discovered even more innovative and fascinating uses for this slimy substance.
Some of these uses are truly remarkable—such as the snot bubbles that help Australian animals survive extreme heatwaves—while others uncover puzzling mysteries. Thanks to this sticky substance, we’ve learned what binds frogs to trees, why sea sponges sneeze, and the real cause behind the water that stings surfers in Florida.
10. Dolphins May Use Snot to Communicate
Dolphins are known for many charming traits—their playful nature, the ‘smile’ on their faces, and the adorable chirps they make. However, their vocalizations remain a bit of a mystery.
Dolphins don't produce sounds with their vocal cords in the throat. Instead, these sounds are generated in the nasal passages, directly beneath their blowhole. Tissue lumps vibrate up to 1,000 times per second to create these sounds. While this is well-known, scientists still struggle to understand how dolphins produce such unique, high-pitched tones.
A computer simulation suggested that mucus might be the key to understanding dolphin sounds. In 2016, biologists used a human vocal cord model to mimic dolphin sounds. One common noise, the bump-and-ring, was initially thought to come from the tissue lumps smacking together. However, the sound changed when mucus was added to the simulated dolphin's nasal passages.
The simulation didn’t replicate the high frequencies until the scientists included a significant amount of mucus in the dolphin's nasal passage simulation. This strongly indicates that without mucus, dolphins would struggle to communicate or echolocate effectively.
9. Sea Sponges Sneeze for Half an Hour
Even though sea sponges lack brains, muscles, or nerves, they can sneeze. When they do, they expel blobs of mucus and sand. Unlike humans, who sneeze in a split second, a sponge’s sneeze lasts for about 30 minutes. Researchers have only recently uncovered the mechanics and reasons behind this unusual behavior.
In 2022, new research confirmed that sponges sneeze to cleanse themselves. Around 81% of the mucus expelled contains unnecessary sediments. While scientists still don't fully understand how sponges know when to sneeze, the process is clear. They release a mucus-like substance through their pores, which then moves along surface features known as 'mucus highways.' Occasionally, the sponge contracts and pushes the sediment-filled blobs into the surrounding water.
8. The SnotBot
A dedicated group of scientists works to monitor and protect whale populations. To learn as much as possible about the health and genetics of individual whales, they used to collect samples by shooting darts into the animals. Seeking a less invasive method, researchers turned to mucus.
This led to a brilliant collaboration involving robots, humans, and whales. The researchers created drones called SnotBots, which collect whale mucus using Petri dishes attached to their sides. The drones don’t have to do much—they simply hover above a breaching whale, which then exhaled its snot into the air.
Without even realizing it, whales are helping researchers study their health through the mucus they release, providing valuable data on the well-being of various whale species, including humpbacks, blue whales, and orcas.
7. Sharks Use Mucus to Hunt
Sharks possess an extraordinary ability to detect tiny traces of blood from vast distances. In 2007, researchers uncovered that mucus is essential to this remarkable skill. Specifically, sharks rely on a jelly-like substance in their heads, rich in salts and proteins, to harness this ability.
The study revealed that this 'shark snot' serves as an electrical conductor. Here’s how it works: When a fish is wounded and bleeding far away, the salts in the blood create an electric field in the water. Sharks can detect this field with special cells in their skin. Once sensed, the positive charge travels through the gel to specific nerves, which trigger electrical signals in the shark's brain, guiding it toward its next meal.
Without this snot-like substance, the electrical signals wouldn't reach the shark’s brain. As a result, sharks would struggle to detect or follow a blood trail.
6. Salamander Goo Outperforms Stitches
The Chinese giant salamander may not be a contender for beauty titles, but it proudly holds the crown as the world’s largest amphibian. Beyond its size, this creature produces a mucus that is gaining significant attention in the medical field. The slimy substance secreted through its skin is proving to be an excellent adhesive for closing wounds.
This sticky white goo isn't used in its raw form. Instead, scientists isolate a bioadhesive called SSAD by freeze-drying the mucus and mixing it with a saline solution. While this glue isn't as long-lasting as traditional methods like staples or sutures, it excels in several other important areas.
Indeed, SSAD doesn’t trigger allergic reactions like many other bio-glues. It also surpasses traditional wound-closing techniques when it comes to sealing cuts, reducing infection, inflammation, and scarring, and promoting faster healing. Additionally, SSAD gradually disappears after three weeks, eliminating the need for a removal process.
5. Snails Reuse Their Mucus Trails
When a snail glides across a patio, it may appear effortless—slow, steady, but not physically taxing. However, producing the mucus necessary for snails to move actually takes more energy than swimming, walking, or even flying. As a result, this energy expenditure can become a survival challenge when food is scarce.
For years, researchers suspected that snails used 'slime highways.' This means a snail follows the mucus trail of another, reducing the amount of slime it needs to produce, thus conserving energy.
It wasn’t until 2007 that the theory was proven when a marine snail was observed traveling along the trail of another mollusk. The subsequent study found that by sticking to these 'follow-the-leader' paths, snails saved a significant amount of energy, producing only a fraction of the mucus that would have been needed to create an entirely new trail.
4. Snot Sinkers Unveil a Marine Secret
The ocean floor is teeming with life, yet scientists couldn’t figure out where all the food for these creatures came from. Despite their efforts, the missing food source remained a mystery for years. In 2005, the answer was finally found—and it was more bizarre than anyone had imagined. Bottom feeders survive on something known as sinkers.
Sinkers are enormous clumps of floating mucus created by Bathochordaeus, a giant larvacean resembling a tadpole. These mucus balls serve to protect the larvacean while also filtering tiny food particles that are the perfect size for these creatures. The Bathochordaeus spins a new ball every day, with each one typically measuring about a yard in diameter.
Each day, the larvacean creates a new 'house.' Once the old one is discarded, it’s already deflating and sinking. As it descends, the sinker collects more food particles and sea creatures, essentially becoming a moving food source for the creatures below.
3. The Truth Behind Stinging Water
For years, surfers and snorkelers were puzzled by a painful mystery. In the shallow waters of Micronesia, the Caribbean, and Florida, a stingy sensation would strike, forcing some swimmers to retreat to shore. The upside-down jellyfish (Cassiopea xamachana) seemed to be the culprit, but it was never found near the victims when they got stung.
With no better explanation, people speculated that the jellyfish might have lost a venomous arm, which floated toward swimmers and stung them. However, recent studies revealed a far stranger—and mucus-filled—truth.
It turns out the jellyfish was indeed the source of the sting. But rather than losing tentacles, these creatures launch 'mucus grenades' filled with venom. While these grenades cause a mild itch and burn on human skin, the real danger is for other marine life. The jellyfish uses these cell-destroying snot bombs to kill smaller sea creatures for food.
2. Snot Bubbles Unravel Echidna Puzzle
In Australia, two things shouldn’t go hand in hand: the scorching Outback heat and small, spiny creatures known as echidnas. These adorable animals, with a look reminiscent of hedgehogs or shrews, can’t survive temperatures above 95°F (35°C), as studies have shown they have very low heat tolerance.
One day, an echidna was spotted comfortably lounging in a hollow log. The strange part? The log’s internal temperature was around 104°F (40°C). It wasn’t an isolated incident, either—several other echidnas were found behaving similarly. Given that echidnas don’t sweat or pant to regulate their body temperature, how are they able to endure these life-threatening conditions?
In a stunning revelation in 2023, researchers uncovered that echidnas use a unique method to cool themselves: they expel snot bubbles. These mucus bubbles burst over their noses, and as the moisture evaporates, it cools both the nose and blood, keeping their body temperature safely below 86°F (30°C) even when the surrounding heat reaches a brutal 116°F (47°C).
1. The Superglue Slug Mystery
In 2019, scientists were exploring the Watagans Mountain Range in Australia when they stumbled upon a puzzling sight. A frog was firmly stuck to a branch, completely covered in a sticky substance, and it had been there for a whole day. The only other creature nearby was a seemingly innocent slug.
It was clear that the frog had tried to make a meal out of the slug, but the slug fought back with an unexpected superglue tactic. This particular species, the red triangle slug, was only known to secrete a thin, non-sticky slime. So how did the slug manage to trap an entire frog with this glue-like substance? The scientists had no choice but to investigate.
The scientists gently prodded the slug to provoke it, and almost instantly, they discovered that it could produce a second kind of mucus. After touching its back, the area contracted, releasing an overwhelming burst of super snot. This rare defensive mucus was unlike anything seen before, and to this day, scientists are unsure how the slugs manage to avoid getting stuck in their own goo.
