I volunteer at the local nature center on Friday mornings, teaching preschoolers all about nature. It is the highlight of my week, surrounded by the chaos of toddlers and tiny-legged runners, all ready to absorb and love whatever I enthusiastically share.
So, of course, in return for this love and mutual enthusiasm, I make them hold creepy crawlies.
Well, I don’t technically force them, but I do encourage and help (and cajole and convince) a lot. In fact, I’ve gotten so many kiddos on board the “Creepy Crawlies are Cool” train that it’s become an expected part of our Friday mornings. We play lots of different games in the nature center yard, but we never, ever forget to roll over a few of the logs and have a look underneath.
And here’s what we find:
I love worms. There, I said it. Worms are amazing creatures not only for what they do – decompose organic matter such as dead leaves and turn it into rich soil – but also for their kid-friendly pick-up-ability. (It’s my blog, I’ll make up whatever words I want.) Worms do not bite or sting. Worms do not even look like they could bite or sting. They are not covered with scratchy scales or poky hairs; they are smooth and cool and wiggly. And, when you put a worm in the hand of a little kid, it’s practically guaranteed that their eyes will grow wide and a joyous grin will spread across their chubby cheeks. They’re doing it! They’re holding a wild animal! And it is awesome.
Wonderful worm facts:
- There are hundreds of species of worms and they live in practically every environment on Earth. The red worms we find in our backyard soil in North America are round, segmented worms, called annelids.
- What’s that darker brown strip that runs through the middle of the worm? It’s their gut! You’re seeing through the body of the worm and all the way to those pieces of dead leaf that they’re turning into soil. Yes, soil is made up of a lot of worm poo. If you’re lucky; gardeners go dreamy eyed over high worm counts and will buy “castings” (that’s the science-y word for worm poo) to add to the soil because their plants will grow so much better.
- Earthworms breathe through their skin. This is why you often see earthworms on sidewalks and streets during heavy rain – the soil becomes saturated with water (soil is usually about 25% air) and the worms must tunnel up and out of the dirt to breathe.
- Earthworms are hermaphrodites (I don’t usually share this fact with the preschoolers), when mating, two worms exchange sperm and both are fertilized. Mating occurs on the surface of the ground, at night. I think of it as “Earthworms After Dark” – cue the seductive lounge music. Their “mommy and daddy parts” are located in the belt-like swelling around their body and eggs are produced there after mating. The the eggs and sperm are later deposited into a vaguely lemon-shaped egg sac, from which tiny, fully-formed worms,
Sometimes when we roll over a log we’ll find a colony of ants or termites busily moving around their underground nest. Usually they are busy moving eggs. Here in Virginia, we don’t have the invasive, biting fire ants that are common throughout much of the deep south, so we can feel fairly safe to squat down and observe the ants up close. I would NOT have attempted that in our previous homes in Texas, Florida, or Louisiana! A few amazing ant facts:
- More than 10,000 different species of ants have been identified around the world.
- Biologist Edward O. Wilson has made studying ants the majority of his life’s work, and his discoveries about ant society and behavior are mind blowing. He’s also written an insightful novel centered around ants, Anthill, which I highly recommend for tweens and adults.
- Ant colonies share some similarities with bee hives; both have just one queen who lays thousands of eggs and all of the workers are females, males have one job: mating with the queen so she can keep laying those eggs.
- Ants communicate with one another by means of chemical scent trails that can lead to a potential food source or alert the colony to danger.
The millipedes we find under logs in the yard are almost always much smaller than the millipedes featured in my previous post, A Moment for Millipedes. They vary in size from about a half inch to one and a half inches, are about the width of a piece of acrylic yarn, and are so light that usually you can’t even feel them walking around on your hand. Millipedes do not bite or sting, and are incredibly important to the ecosystem because they eat and break down dead vegetation such as fallen leaves and rotting logs. Some memorable millipede facts:
- Though the Latin origin of the word millipede, milli for 1,000 and ped for feet would have us believe that all millipedes have that many legs, that’s a wild exaggeration. Most millipedes have less than 100 legs (always two pairs per body segment, though) and the record-holder has just 750 legs.
- Millipedes are long-lived among the arthropods. They can survive up to seven years. Sounds like a great pet – an aquarium with a lid, regular meals of rotting food, and you’ve got a friend for half of your childhood.
- The fossil record leads us to believe that millipedes were the first animals to live on land. A 428 million year old fossil of a millipede (Pneumodesmus newmanii) found in Scotland in 2004 is the oldest known animal to have body parts called spiracles (tubes that connect the inner body to the outside air) for breathing air.
What’s the difference between centipedes and millipedes? There are many differences, but as a children’s nature teacher, the one I find most important is that centipedes can bite. I have never been bitten, though I’ve had them crawl over my hand, but I still don’t advise picking them up. The gentle pinch required to lift them may feel like an attack to a centipede (much like when King Kong picked up Fay Wray) and they may bite in defense.
Centipedes we find under logs also looked markedly different from the millipedes, so it’s easy to know which creatures to leave alone. The centipedes have a decidedly orange tint to their exoskeleton, and their legs (one pair per body segment, if you’re counting) stick out from the sides of their bodies, whereas millipedes legs are neatly tucked beneath their bodies.
Centipedes are the hunters of the under-log world, and therefore move much faster than herbivorous millipedes. (Carnivores need speed to attack. A good comparison for centipede vs. millipede speed would be a wolf vs. a cow.) Centipedes will eat small insects, snails, slugs, and worms. A celebratory collection of centipede facts:
- Just as millipedes don’t have 1,000 legs, centipedes don’t always have 100 legs, though the number is usually between 30 and 360.
- Centipedes can regrow legs that have been lost to birds or other predators with each new molt (shedding of the exoskeleton as they grow).
- Over 3,000 species of centipede have been documented worldwide.
Ahh, the invasive leopard slug (Limax maximus). Foe of the gardener and friend of the toddler who doesn’t mind slimy hands. (The look on their parents’ faces when the tots joyfully hold up a palmfull of slug is excellent.) We find lots and lots and lots of leopard slugs under logs. These non-native creatures have done incredibly well here in the U.S., despite my mother’s valiant attempts at trapping them with old margarine tubs half full of my father’s Pabst Blue Ribbon.
I don’t grow veggies, so they don’t bother me much, and I have to admit to even liking them a bit after falling in love with the slug character Mub in the animated kids’ film Epic. (Mub’s friendly insult to one of the human-like “leaf men”, calling him a “flat-face” was, in itself, epic.) I encourage the kiddos to hold the slugs until they relax and extend their eyestalks. Eyes at the end of long, antennae-like, telescoping appendages are just plain cool to kids of all ages. Some super slug facts:
- Slug eggs look like tiny tapioca pearls, and are frequently and easily found under logs or between the bark and core of a rotting log.
- It’s plain to see that slugs and snails are related, but did you know that they’re also related to marine cuttlefish? (Obviously the cuttlefish don’t react to salt the same way . . .)
- Slugs are soil janitors, eating both live and dead plants as well as dead animals (omnivorous decomposers ain’t choosy) and digesting them into nutrient rich castings that enrich the soil.
- The banana slugs that live in the Pacific Northwest of North America are the second largest slugs in the world, growing up to eight inches long!
In wet, cool weather, rolling logs and lifting the leaf layer on a forest floor may get you a glimpse of a salamander. They are fast little creatures, and sunlight means danger in their world (a number of predators find them quite tasty, and to be seen is to be lunch), so it takes practice to snatch one up before it darts off and hides again.
I am, as I’ve said, very lucky when it comes to nature, though. In this case, it’s because my daughter is a nature girl, too: my daughter is Queen of the Salamanders. She finds and catches them all over the place! In one day at the Nature Center she caught a half-dozen! I am one puffed-up, proud mama.
A selection of superlative salamander facts:
- Salamanders are amphibians. They breathe through their skin, and their skin must stay wet in order for them to breathe. Though their cousins, the frogs, have lungs as adults, they also breathe through their skin when submerged in water.
- Salamanders can regenerate limbs and tails that have been bitten off by predators within just a few weeks. The hunter gets to eat the leg, but the salamander gets away.
- Virginia is very special, salamander-wise, home to 49 different salamander species. Many of these species are found in mountain woods, and the Virginia Appalachians are considered a salamander hotspot. Check them out at the Virginia Herpetological Society’s website.
There are many, many more species to be discovered in and under rotting wood (this is why woodpeckers are always pecking holes in dead trees – there’s a buffet under the bark) but I think we’ll leave it here for now. Today is National Get Outdoors Day, and that’s exactly what I’m going to go do!