If you’ve ever walked through our local forest trails right after the rain, you’ve likely had to step around a slimy slug or two on your path. Or perhaps you’ve come across a tiny, spiraled house moving slowly across a fern? If you stopped to take a closer look, you were already doing the work of a scientist!
Today, we’re doing a deep-dive into the slow-motion world of malacology. Grab your magnifying glass and your rubber boots – it’s time to meet the incredible slugs and snails of Maple Ridge.
What is a Malacologist?
“Malacology” sounds like a big, complicated word, but it’s actually quite simple. You might already know that -ologist is a special ending for a word that means “someone who studies.”
A biologist studies life. A geologist studies rocks.
And a malacologist? They are the scientists who study mollusks!
Say it with us: Mal-a-col-o-gist (mal-uh-koll-uh-jist)
Mollusks are a huge group of animals that includes creatures in the ocean (like octopuses and clams) and creatures on land (like our slimy friends, the slugs and snails). Studying them is incredibly important because they are like the “health inspectors” of the forest. By looking at how many slugs and snails are in a habitat, scientists can tell if the environment is healthy, moist, and full of life.
What Makes a Mollusk, a Mollusk?
Even though a slug and an octopus look very different, they share some “family traits.” All mollusks have soft bodies. Most of them have a special organ called a mantle, which is what creates their hard shells.
Think of a snail like a traveler who carries their bedroom on their back! Slugs, on the other hand, are essentially snails that evolved to lose their shells so they can squeeze into tighter hiding spots under rocks and bark. Instead of a shell, slugs use a thick layer of slime to protect their soft bodies from drying out.
Fun Fact: Did you know that slugs and snails eat with a “toothy tongue” called a radula? It’s a tiny, rough ribbon covered in thousands of microscopic teeth that they use to scrape up their food, almost like a miniature sandpaper tongue!
The Forest’s Cleanup Crew
Why do we need slugs and snails? Well, without them, the forest would be a very messy place!
Snails and slugs are decomposers. This means they spend their days eating fallen leaves, rotting plants, fungi, and even animal poop. They turn that “trash” into nutrient-rich soil that helps big trees like Western Red Cedars grow tall. Plus, they are a very important “forest snack” for other animals like garter snakes, frogs, and birds. They are a vital link in the Maple Ridge food web!
Meet the Locals: Maple Ridge Species
If you open your iNaturalist app, you’ll see that Maple Ridge is a hotspot for mollusk diversity. Here are some stars that you’re likely to find in the UBC Malcolm Knapp Research Forest:
1. The Pacific Banana Slug (Ariolimax columbianus)
The undisputed king of the Pacific Northwest. These are the second-largest slugs in the world, growing up to 25 centimeters long – that’s almost the size of a ruler!
Fun Fact: Banana slugs aren’t always yellow. While many look like a ripe banana, some are olive green or even have dark spots like a bruised banana. This camouflage helps them hide from hungry crows.
2. The Black Slug (Arion ater)
You’ll often see these big, chunky slugs on the trails after a rainstorm. They can be jet black, chocolate brown, or even bright orange.
Field Note: When black slugs feel threatened, they don’t crawl away. Instead, they contract their body into a round ball and vibrate to try and look unappetizing to predators!
3. The Pacific Sideband Snail (Monadenia fidelis)
As the largest native land snail in British Columbia, the Pacific Sideband is a true forest celebrity. While most snails stay on the ground, these talented climbers are often found high in the canopy, showing off their impressive chestnut shells and deep reddish-purple bodies.
Fun Fact: If you see a shell with a ‘lip’ that flares outward like the bell of a trumpet, you’ve found an adult! This thick edge shows the snail is fully grown.
4. The Leopard Slug (Limax maximus)
Just like the big cat, this slug is covered in spots. It’s an introduced species that originally came from Europe.
Fun Fact: These slugs are surprisingly fast! Well… fast for a slug. They are also famous for their incredible acrobatic stunts, where they dangle high from tree branches on a shimmering string of slime!
5. The Brown-Lipped Snail or Grovesnail (Cepaea nemoralis)
These are the classic snails you might find in your garden or near the forest edge. They often have beautiful yellow or brown stripes circling their shells.
Fun Fact: A snail’s shell grows with them! They use calcium from their food to make the shell bigger and stronger as they get older.
For more help with snail identification, check out Common Land Snails of BC’s South Coast.
How to Be a Slug Superhero: Observation Tips
Ready to head out into the Wild & Immersive forest? Here’s how to find and safely identify slugs and snails:
Follow the Slime Trail
Mollusks produce “pedal mucus” (slime) to help them glide over rough ground. If you see a silvery, shimmering path on the sidewalk or a log, follow it! It’s like a treasure map leading straight to a mollusk.
Check Under the Furniture
Slugs and snails hate the sun because it dries them out. Carefully peek under fallen logs, large leaves, or loose bark.
Important Rule: If you move a log or a rock, always put it back exactly how you found it. That’s someone’s home!
Look With Your Eyes, Not Your Hands
Our skin has oils and salts that can actually hurt a slug or snail. If you want to get a closer look, let them crawl onto a wet leaf instead of your hand.
Take Detailed Notes
Check the shell (or lack thereof). Is it one solid color or striped? Does the slug have a “hump” (the mantle) near its head? Taking a photo and uploading it to iNaturalist is a great way to learn the names of your new friends.
A World in Slow Motion
The next time you’re exploring in the forest, slow down. Look at the tiny worlds beneath the ferns and along the trails. These “lowly” slugs and snails are actually forest engineers, working hard every day to keep the ecosystem running.
Whether they’re bright yellow, spotted like a leopard, or carrying a spiral home, every mollusk has a story to tell.
Want to learn more? Join us for a Wild & Immersive program where we head off-trail to discover the hidden wonders of Maple Ridge!
