Why Do Snails Leave Slime Trails?

If you had to make a list of the top five animals you would want as a pet, what would you choose? Many people would probably choose a dog because they are known as man’s best friend. Others might choose a cat because they are cute and furry.

But what other animals would be on your list? A hamster? A gerbil? A tank of fish? A turtle? How about a snail?

Some of you might be thinking, “Who would want a snail as a pet?” Other than SpongeBob SquarePants, there probably aren’t many of our Wonder Friends who have pet snails. After all, they are not cuddly and they move very slowly. And then there’s the issue of slime.

If you have ever seen a snail (or a slug) in the wild, you have probably noticed the slimy trail they leave behind as they move slowly across the grass or a leaf. Can you imagine finding trails of slime all over your bedroom floor or pillow? Gross!

So what’s the deal with snail slime? Snails are gastropods. “Gastro” means stomach and “pod” means foot, so a snail is essentially a “stomach foot.” This description makes sense since a snail’s body is like one long foot with a mouth at one end.

Snails produce slime, which is a type of mucus, from a special gland on the front of their foot. Scientists initially thought that the purpose of the slime was to help snails move. However, over the years, researchers have discovered that snail slime is a unique substance with special properties and various purposes.

Snail slime is a liquid gel. When at rest, it is solid and sticky. Under pressure, it becomes liquid and acts as a lubricant.

Although slime helps snails move more efficiently, they do not rely on it to move. They have muscles on the underside of their feet that generate pulses to propel them forward.

As they travel on the slime they produce, it helps them stick to surfaces while their muscles are at rest. When their muscles contract and push down to move forward, the slime becomes more liquid and makes movement easier.

Slime is especially useful when snails climb vertical surfaces or travel upside-down. The sticky properties of the slime help snails cling to surfaces, seemingly defying gravity!

Snails constantly produce slime, even when they are not moving. When they do move, they leave a trail of slime that appears as a silvery track on different surfaces. When they are not moving, the slime serves another important purpose.

In addition to aiding movement, the slime helps protect snails’ skin from environmental hazards like sharp objects, bacteria, and the Sun’s ultraviolet rays. In dry weather, snails can curl up in their shells and seal themselves inside using their slime. This helps them stay moist and comfortable even when the weather threatens to dry them out.

Try It Out

We hope you enjoyed today’s slimy Wonder of the Day! Get some friends or family members to join you in exploring the following activities:

  • If you have an affinity for snails, then you should definitely take a look at The Most Amazing Up-Close Snail Photos You’ll Ever See. Which snail picture is your favorite?
  • Can you simulate being a snail? Lie down on the floor and try to move forward very slowly, just an inch or two at a time. Attempt not to use your arms and legs at all. How successful are you in reaching your desired destination? Can you see how slime might aid snails in moving more easily?
  • Snails utilize their slime as a means of protecting their skin from cuts and the harmful rays of the Sun. How do you safeguard your skin? Obviously, you don’t produce a protective layer of slime, so how do you ensure that your skin remains healthy? Consider the various ways in which you take steps to protect your skin. What substances do you regularly use on your skin? Engage in a discussion about skincare with a friend or family member. What measures do they take to protect their skin?

Sources of Wonder

  • https://en.wikipedia.org/wiki/Snail_slime
  • http://animals.mom.me/slime-comes-snails-slugs-5801.html
  • http://news.stanford.edu/news/2011/april/snail-slime-trails-040611.html
  • http://www.in.gov/dnr/kids/5878.htm


1. Why do snails leave slime trails?

Snails leave slime trails as a means of locomotion and protection. The slime is produced by glands located on the foot of the snail. As the snail moves, it secretes the slime which helps reduce friction between its body and the ground, allowing it to glide smoothly. The slime also acts as a lubricant, making it easier for the snail to navigate rough surfaces or climb walls. Moreover, the slime trail provides a protective layer, helping the snail retain moisture and preventing it from drying out. This is especially important for snails as they are sensitive to dehydration.

2. How is the slime trail produced?

The slime trail is produced by special glands called the pedal glands, located on the foot of the snail. These glands secrete a thick, mucus-like substance which is then released onto the ground as the snail moves. The slime is made up of water, proteins, and carbohydrates, giving it its unique texture and stickiness. The snail controls the amount of slime it releases by regulating the activity of these glands. When the snail is in motion, the glands work harder to produce more slime, ensuring a smooth and protected journey.

3. Why is the slime trail shiny and slimy?

The slime trail left behind by snails is shiny and slimy due to its composition and purpose. The slime is primarily made up of water, which gives it its wet and shiny appearance. It also contains proteins and carbohydrates that contribute to its sticky and slimy texture. The shininess of the slime trail is important for the snail as it helps retain moisture and prevents it from drying out. The sliminess of the trail serves as a protective barrier, making it harder for predators to follow the snail’s path and increasing its chances of survival.

4. Do all snails leave slime trails?

No, not all snails leave slime trails. While most snail species are known to produce slime trails, there are some exceptions. Some land snails, for example, have a reduced ability to produce slime or lack the glands altogether. These snails rely on other methods of locomotion, such as muscular contractions or foot undulation, to move around. Additionally, some aquatic snails do not leave slime trails as they move through water, where the need for slime as a lubricant and protective barrier is not as crucial as on land.

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