One evening when I was a child, I had an unexpected encounter with a black rock scorpion began a fascination that has lasted for decades and eventually led to university research, keeping scorpions of my own, and a lifelong appreciation for these remarkable arachnids
The black rock scorpion (Urodacus manicatus) is the first scorpion I ever saw in real life, I was fascinated by it then and am still fascinated by scorpions now. They are a small and relatively calm scorpion that is native to the east coast of Australia.
Back then I had seen plenty of scorpions in encyclopedias and other books, and on documentaries, but nothing really prepared me for what it was like in real life. These small creatures are amazing to watch, I still find it hard to stop watching them.
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| Scorpions glow under UV light |
The first scorpion I saw in real life
I was watching TV one evening as a child and a scorpion ran across the living room floor. I caught it and put it in a plastic ‘bug catcher’. From there I kept it for a while, having no concept of how to look after it properly, marvelling at this amazing creature while it ate flies and other insects that I fed to it. I eventually released this scorpion into the garden, which is a good thing because I can’t imagine it would have survived terribly long in a bug catcher.
Now when I keep scorpions, even for a few days, I don't use 'bug catchers'. I now use a small plastic aquarium because it is easy to clean, provides good ventilation, and makes observing the scorpion much easier. These have a secure lid with ample ventilation.
I also really like the look of the tiny aquariums that look like a lego block, they should work as they also have a secure lid. I'll tell you why the lid is super important later in this post. (Spoiler alert: I had a scorpion escape!)
Back then I was never confident to pick up the scorpion, and I am glad I didn’t because I could have hurt it.
I was fascinated that they were arachnids, yet I counted ten legs. It wasn’t until years later that I discovered that the pinchers at the front are not legs, but are pedipalps (pedipalps are almost like enlarged mouth parts). If you don’t count the pinchers then the number of legs is eight, which makes me more comfortable as it fits in with my understanding of arachnids.
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| Urodacus manicatus glows under UV light |
My Scorpion Research at University
When I was a university student I got to see more of these delightful arachnids. As part of "Behavioural and Physiological Ecology" I did an experiment involving scorpions. A friend took me out to a hill where the scorpions lived, and we collected a few.
For the experiment we got a light on a timer, put some scorpions in a tank with a thermogradient, attached a thermocouple to the back of each scorpion, and logged how changing light patterns altered their circadian rhythm.
I forget how long that experiment ran, it was at least a few weeks, if not a few months. I handled those scorpions every day and grew really attached to them. At the end of the experiment we released them back on the hill where we collected them. I was surprisingly sad to see them go.
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| Black rock scorpion exploring the aquarium |
Baby scorpions as pets
During that time I also kept two baby scorpions that I had also collected from the same spot. These had nothing to do with the experiment, I thought they were cute and I kept them at home in a small container.
They were both the same age, and much the same size, one was very shy and the other far more outgoing and interactive. I used to catch small insects to feed them. I tried to always keep some tiny insect in there for them to eat, but they couldn’t always find it. I knew if they were hungry because they would walk around with their tail twitching slightly, so I would catch the insect with tweezers and hold it until a scorpion grabbed it. I use long feeding tweezers for handling insects safely, I find feeding tweezers to be ideal for feeding scorpions.
One night I left the lid off the container the baby scorpions lived in, and the outgoing one escaped and was never seen by me again. I missed it, but I still had one. The one that didn’t escape eventually moulted, which was utterly fascinating. They get very hungry for a while before moulting, and then stop eating completely. To shed they squeeze their entire body out of a tiny hole near the mouth. They have tiny wrists and big pinchers, so to squeeze out of here they are very soft.
After moulting they need time to harden so must be left alone. After a few days their exoskeleton hardens and they are ready to eat again.
I had a bottle cap of water in the container and one day my tiny scorpion fell in and I had to rescue it. I didn’t know how to pick it up without being stung, I panicked and put my finger in and it grabbed hold of me. I then carefully lifted it out and let it walk off my finger back into the container. It didn't sting me.
After that I kept a damp cotton wool ball in there for water because I was scared it would fall in again when I wasn’t there to save it. I can’t remember exactly what eventually happened to this little one, it was a lot of years ago, I have a feeling that I released it where I got it from before moving house.
One really cool thing about all scorpions is that they fluoresce brightly under ultraviolet light. The exact mechanism behind fluorescing in ultraviolet light is still under debate. Their exoskeleton contains hyaline, which makes the exoskeleton strong, and is thought to be the part that glows under UV light. The babies and ones that recently shed their skin don’t really glow, but once the skin hardens they all glow. Even more remarkably, some fossilised scorpions even fluoresce under ultraviolet light.
I still keep its first exoskeleton safely in a little jar in my drawer. Even though it has been over twenty years, the exoskeleton still fluoresces under ultraviolet light.
Why do scorpions glow under UV light?
Scientists are still debating the exact purpose and mechanism behind this, but compounds in the exoskeleton fluoresce brightly when exposed to ultraviolet light. This makes scorpions easy to find at night using a cheap UV torch.
I like to use a small UV torch to make scorpions glow, these ultraviolet torches are ideal. Going out on a warm night with an ultraviolet torch is one of the easiest ways to find scorpions.
While I rarely put the UV torch on my scorpions, some people have a UV torch to use when displaying them. Prolonged exposure to ultraviolet light reduces fluorescence over time, although the exact reasons behind this are not fully understood. They will not glow as bright over time if you keep the light on them too much, but every once in a while does not appear to have any adverse effects.
Scorpions aren't the only natural thing that glows under UV light. I wrote an earlier post on glowing lichen, while my pictures don't do it justice, some of these lichens glowed bright orange. I also wrote another post on using these same ultraviolet torches to make various things such as honey, spider webs, and corn stalks glow.
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| Baby scorpion exoskeleton under normal light |
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| The same baby scorpion exoskeleton under UV light |
Black Rock Scorpion Conservation and Breeding
My fascination with these creatures eventually led me to consider keeping and even breeding them. I have read that it takes about two or three years for a baby black rock scorpion to reach maturity, which is a long time. From there it can be difficult getting them to mate and not harm each other.
Scorpions give birth to live young, after mating the gestation period is about sixteen months, which is a very long time for such a tiny animal. Sometimes the mother will eat the babies, other times she won’t, sometimes the babies will eat each other, and other times they don’t.
All of this means it takes several years from a baby scorpion birth until it has a baby scorpion of its own. This also means most scorpions for sale have been taken from the wild as breeding them sustainably takes a long time and a lot of effort.
I am told that the black rock scorpion can live up to a dozen years, with eight to ten being pretty common in the wild. Given how long they live, and how long they take to reach maturity, and how long their gestation is, and that collectors sometimes take every single mature specimen they can find in an area, these scorpions really do need to be raised sustainably rather than taken from the wild.
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| I still find black rock scorpions fascinating |
A Lifelong Fascination
It has been decades since that first black rock scorpion crossed the living room floor, yet I still stop to watch them whenever I get the chance. What began as childhood curiosity grew into scientific study and a deep respect for these remarkable arachnids. Every time I see one scurrying after some prey insect, or glowing under ultraviolet light, I am reminded of the fascination that started all those years ago.
Despite their fearsome reputation, black rock scorpions are calm, fascinating creatures that have taught me a great deal about observing and appreciating the natural world. Even today, I still keep that tiny exoskeleton in a jar, a small reminder of an animal that sparked a fascination which never really faded.
At some stage I may sell scorpion kits, and possibly captive bred individuals. If I do, they will appear on my for sale page. Live animals would likely be offered for local pickup only rather than postage.























































