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Snails
 
If you’ve got a veggie garden, you’ve surely seen snails nibbling on your vegetables lately.
 
When was the last time you looked at a snail closely?
Snails are one of those animals that people often encounter but don’t tend to appreciate the sheer complexity of the way they work. The humble snail is quite an incredible little animal, one which operates very differently than we do!
Snail eyes
 
Land snails have two pairs of tentacles, with eyes on the tips of the longest pair. The ability to turn their eyes inside out is an amazing adaptation to protect their eyes and it’s a great space saver. The eye-stalks actually invert when they are withdrawn – just like a rubber glove being pulled back inside itself. 
 
Snail slime
 
Their unique method of sliding along on a single ‘foot’ while releasing a bed of low-friction mucus is perfect for their way of life, but does require a humid or wet environment to avoid drying out. Cruising this way has its advantages; you can travel anywhere; upside down, and also over sharp objects. A snail can slide over the edge of a razor blade without cutting itself!
 
Snail slime experiment
Are snails just sticky and icky, or does all that slime have super powers?
In this experiment, you’ll discover the power of the tiny snail.
 
Question:
 
How powerful is a snail’s slime?
 
Materials:
 
Snail
Sand
Pieces of leaf
Small coin
Piece of clear plastic
Lettuce
Notebook and pencil
 
Procedure:
 
  1. Get ready for some slimy fun! Find a garden snail and set up your experiment outdoors so that the snail feels comfortable in its natural environment.
  2. Create a hypothesis, your best guess about what is going to happen. What will happen if you allow the snail to move across the piece of clear plastic? If the plastic gets slimy, do you think that objects will stick to it?
  3. Set your snail free at one end of the clear plastic, and wait. Snails aren’t known to be fast walkers, so you might have some time on your hands. If the snail looks like it’s moving off of the plastic, gently move it back on. If the snail hides in its shell, that’s all right – it’s feeling shy. Leave it alone for a few minutes or gently spray it with some rainwater and it will feel better.
  4. After the snail has completed its walk to the other end, let it go. Give it a piece of lettuce to munch on as a thank you.
  5. Now, look at what the snail has left behind. You should see a thin, clear layer of slime. Now you can explore snail power!
  6. First, place a small piece of leaf on a clean surface. Press the piece of slimy plastic onto the leaf, and move it up into the air again. What happens?
  7. Next, try the same thing with the coin. What happens?
  8. Finally, place some sand on the surface and press the plastic onto that. What happens? As you do each part of the experiment, make notes in your notebook or get an adult to help you do this. If you wish, you can use a stopwatch to see how long certain things stick to the slime.
  9. When the experiment’s done, make sure to wash your hands!
 
Results:
 
Snail slime is pretty sticky! If your paper is slimy enough, you should be able to pick up small pieces of leaf. If it’s really slimy, you may even be able to pick up a dime for a short time. Sand will stick to the slime trail on the paper, making it look like a sandy pathway.
Why?
Snails are amazing figure skaters. They move their long, muscular foot along the ground, sliding on a rink that they make with their slime. This allows the snail to move across bumpy places that might otherwise hurt its sensitive foot.
 
What is snail slime made of?
 
Slime is made of sugars and protein, and it’s fairly similar to the goopy mucus that comes out of your nose when you’re sick. One difference is the way the snails use their slime: they use it to move. Snail slime is a slippery liquid when it’s under the snail, but when the snail has moved on, the slime left behind starts to become stickier. These two different properties allow the snail to glide over rough terrain and climb up the sides of plants and trees without falling off.
 
When you experimented with the slime, you should have found that it was pretty sticky. Leaves, sand, and even heavier things like coins can stick to the slime. If you’d like to lift heavier things with snail slime, you probably need a large amount of slime. Snails make more slime when it rains, and their slime gets bigger in water.
 
Snail slime is so amazing that it’s even being used in beauty creams and facials!
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