From the keeper's bench
Practical advice, species deep-dives, and things we've learned the hard way.
Beetle breeding: getting started
Breeding beetles is one of the most satisfying parts of the hobby. Watching a pair of adults produce eggs that develop into larvae, pupate, and eventually emerge as a new generation of adults gives you the complete picture of a beetle's life cycle.
Rubber Ducky isopods: why so popular?
If you have spent any time looking at isopods online, you have seen the Rubber Ducky. Cubaris sp. "Rubber Ducky" has become the poster child for the isopod hobby, commanding prices that make people question whether the world has gone mad.
Exotic pet insurance for invertebrates: is it worth it?
This is one of those questions that comes up periodically in invert keeping groups, and the short answer is: probably not, for most invertebrate keepers. But the longer answer involves understanding why.
Invertebrate keeping for kids
Kids and invertebrates can be a great combination. These are animals that teach real biology, that live in the house without taking it over, and that give a child real responsibility without the commitment of a dog or cat.
Jumping spider enrichment and play
Jumping spiders are visual, curious, active hunters with genuinely complex behaviour. They notice things. They investigate things. And in a bare enclosure, they get bored.
Lighting for invertebrate enclosures
Lighting is one of the less discussed topics in invertebrate keeping. Unlike reptiles, the vast majority of invertebrates do perfectly well under ambient room light or a simple day/night cycle. But lighting is not irrelevant.
How long do millipedes live?
Millipede lifespans vary a lot between species. Some of the smaller tropical species live two or three years. Large species like the giant African millipede can live seven to ten years with good care.
Seasonal care: winter and summer
The UK has enough seasonal variation to cause problems if you are keeping tropical invertebrates in a room with no climate control. A room that is 22C in March can hit 30C in a July heatwave or drop to 14C in January.
How jumping spider eyes actually work
The first thing anyone notices about a jumping spider is its eyes. Those oversized front lenses give it a face-like appearance. But what's actually going on behind them is stranger and more interesting than most people realise.
Beetle jelly vs fresh fruit
Every beetle keeper eventually has this conversation: should I feed beetle jelly, fresh fruit, or both? The short answer is both. The longer answer is that each option has trade-offs.
Common jumping spider health issues
Jumping spiders are hardy animals. They're forgiving of imperfect conditions and rarely get sick if the basics are right. But when something does go wrong, options for treatment are limited.
Starting an invertebrate breeding business in the UK
Every hobbyist who ends up with a thriving isopod colony eventually has the same thought: "I have hundreds of these. Could I sell them?" The answer is yes, you can. Whether you can make meaningful money is a different question.
Ventilation vs humidity: finding the balance
Every invertebrate enclosure involves the same trade-off. Your animals need humidity to survive, but they also need fresh air. Getting the balance right is not difficult once you understand the relationship.
Dairy Cow isopods: Porcellio laevis care
The "Dairy Cow" morph is one of the most popular isopods in the hobby. The patterning is distinctive, the animals are big enough to actually observe, and the colonies grow quickly.
How many legs does a millipede actually have?
The name "millipede" comes from the Latin for "thousand feet," which is misleading. No commonly kept millipede species has a thousand legs. Most have somewhere between 100 and 400.
Sphagnum moss in invertebrate keeping
Sphagnum moss turns up in nearly every invertebrate keeper's supply shelf. It holds an absurd amount of water relative to its weight, it resists rot, and it is useful in about a dozen different ways.
Stress in invertebrates
Invertebrates do not express distress with vocalisations or facial expressions. But they do respond to stressful conditions with measurable behavioural and physiological changes, and prolonged stress kills them.
What do jumping spiders eat?
Jumping spiders eat other invertebrates. Live ones. That's the non-negotiable part of keeping them. If you aren't comfortable keeping cultures of flies and dropping them into a small box to be stalked, jumping spiders probably aren't for you.
Where to buy exotic invertebrates in the UK
Where you buy your animals matters. A healthy, captive-bred animal from a good source will settle in well and live a normal lifespan. A stressed, poorly kept animal may arrive with parasites or just die within weeks.
Do jumping spiders bite?
Yes. Jumping spiders can bite. They have chelicerae and venom, because that's how they kill their prey. But the question people are really asking is "are they dangerous to me?" and the answer is no.
Giant flower beetle care guide (Mecynorrhina torquata)
Mecynorrhina torquata is one of the largest flower beetles in the world. Males can reach 8-9cm and come in a range of colour forms. This is not a beginner beetle, but a good next challenge for experienced keepers.
Best low-maintenance invertebrates
Some people want a pet they can enjoy without spending half an hour on it every day. No living animal is zero maintenance, but you can find species that need attention twice a week rather than twice a day.
Shipping live invertebrates: what to know
Buying invertebrates online and having them shipped to your door is completely normal in the UK hobby. But receiving a living animal through the post is different from receiving a book, and there are things worth knowing.
The insect decline: what keepers can do
The language is dramatic, but the underlying science is real. Insect populations across much of the world are declining, and the consequences matter far beyond the insects themselves.
Armadillidium vulgare: the common pill bug
Armadillidium vulgare is probably the most recognised isopod on the planet. It is the one that rolls into a ball. Hardy, tolerant, and available in some genuinely attractive colour morphs.
Setting up a jumping spider enclosure
Jumping spider enclosures are one of the simplest setups in the invertebrate hobby. You need a ventilated box, some stuff to climb on, and a way to get water droplets on the walls. But the details matter.
Why millipedes need calcium (and how to provide it)
If there's one piece of millipede care advice that gets repeated more than any other, it's this: provide calcium. Calcium deficiency is one of the most common causes of health problems and death in captive millipedes.
How much does it cost to keep invertebrates?
One of the genuine advantages of keeping invertebrates over most other pets is cost. But "cheap" is relative, and costs vary a lot depending on what you keep.
Are millipedes poisonous?
The short answer is: they're not venomous, some species do produce toxic secretions, and in practical terms they're safe to keep and handle. But the full answer involves a bit of chemistry.
Jumping spider sling care
Baby jumping spiders, called slings, are among the most appealing tiny animals you'll ever keep. They're miniature versions of the adults, complete with the head-tilting curiosity, just at a fraction of the size.
Leaf litter: why your invertebrates need it
Leaf litter is one of the most important components in nearly every invertebrate enclosure. Without it, the substrate dries out faster, the animals have fewer places to hide, and the detritivores have less to eat.
Quarantining new invertebrates
The temptation is to add new animals straight into an existing setup. Do not. Quarantine new invertebrates first, every time, even when they look perfectly healthy.
Invertebrates in education
Within a week of setting up an isopod colony for a primary school science project, kids who would not normally sit still were crouched around a plastic tub watching woodlice eat leaves. Invertebrates work well in education.
Porcellio scaber: complete care guide
Porcellio scaber, the rough woodlouse, is probably the most commonly kept isopod in the UK hobby. Hardy, adaptable, and available in a growing range of colour morphs, it is the species most people start with.
Japanese rhinoceros beetle care (Trypoxylus dichotomus)
Trypoxylus dichotomus is one of the most widely kept beetle species in the hobby. Males have a dramatic forked horn. They're a solid step up from flower beetles if you've already kept Pachnoda.
Best jumping spider species for beginners in the UK
If you've seen a jumping spider on social media and now you want one, the question is which one. Only a handful are commonly available in the UK hobby, and some are much better first spiders than others.
Breeding millipedes in captivity
Breeding millipedes is either very easy or incredibly slow, depending on the species. Small tropical species reproduce readily. Large species like Archispirostreptus gigas breed so slowly that some keepers wait years.
Springtails: the cleanup crew your terrarium needs
If you keep invertebrates in any kind of naturalistic or bioactive setup, you should probably be keeping springtails too. They are tiny, cheap, easy to culture, and they do the one job nobody else wants: eating mould.
Toxic substrates to avoid
Get the substrate wrong and you will poison your animals slowly without any obvious external cause. The beetle larva just stops growing. The isopod colony quietly crashes. Here is what to avoid and why.
Male vs female jumping spiders
Both make good pets, but the differences between them are real and worth understanding. Sexual dimorphism in jumping spiders is pronounced enough that males and females can look like completely different species.
Photographing your invertebrates
If you have ever tried to photograph a jumping spider and ended up with 40 blurry shots of where it was a millisecond ago, you are not alone. You do not need expensive gear to get good shots.
Common mistakes new keepers make
Every experienced keeper has a list of things they did wrong early on. Most of us lost animals because of it. Nearly all these mistakes are avoidable if someone tells you about them in advance.
Understanding isopod morphs and genetics
Ten years ago, isopod keeping meant grey woodlice in a tub. Now there are dozens of colour morphs across multiple species, with new ones appearing regularly. But what actually is a "morph" and how do the colours work?
A complete guide to keeping jumping spiders
Jumping spiders are probably the easiest invertebrate to recommend to someone who's never kept one. They're small, their care is genuinely simple, and they have a quality most invertebrates lack: they look at you.
Sun beetle care (Pachnoda marginata)
Pachnoda marginata, the sun beetle, is a flower beetle from West Africa. If you've heard anyone recommend a "first beetle," it was probably this one. They're cheap, colourful, and breed easily.
Dynastes hercules: keeping the Hercules beetle
Males can reach over 17 cm in total length, making them one of the longest beetles on Earth. They're impressive animals and a genuine commitment, but worth the effort if you're prepared.
Joining the invertebrate keeping community
The community is still small enough to be properly helpful. Unlike some pet hobbies where forums are full of gatekeeping, most invert groups in the UK are welcoming to new keepers.
Cork bark in terrariums
If I had to pick one material to put in every invertebrate enclosure, it would be cork bark. Flats for hides, tubes for climbing, small chunks mixed into substrate. It does a lot of jobs well and lasts for ages.
How long do jumping spiders live?
Most pet jumping spiders live somewhere between 6 months and 2 years. The longer version involves sex, species, temperature, and a fair bit of individual variation.
Dehydration in invertebrates
Dehydration kills more captive invertebrates than most keepers realise, and it can happen fast. If you spot the signs early, you can usually fix it. If you miss them, the animal dies.
Dwarf vs giant isopods: a size comparison
Terrestrial isopods range from species you can barely see without a magnifying glass to chunky animals that fill the palm of your hand. In practice they're almost different hobbies.
Trigoniulus corallinus: the rusty millipede
Trigoniulus corallinus is a small, fast-breeding species that's become popular in bioactive setups. They're not a handling pet like giant millipedes, but they're interesting and dead simple to keep.
Millipede substrate: getting the foundation right
Substrate is the most important thing in a millipede enclosure. Millipedes live in their substrate, eat it, moult in it, and lay eggs in it. If the substrate is wrong, nothing else you do will keep them healthy.
How to make flake soil
Flake soil is the backbone of beetle keeping. It's the primary food source for most beetle larvae, and buying it ready-made gets expensive. Making your own is cheaper but takes time and patience.
Isopod breeding: a complete guide
Isopods breed readily in captivity. If your husbandry is correct, breeding happens without any special effort. But understanding how it works helps you troubleshoot when a colony is not growing.
What to feed your invertebrates
Feeding invertebrates is straightforward once you understand what each group actually eats. An isopod eating leaf litter has nothing in common with a jumping spider catching flies. Getting the food right matters.
Substrate depth for beetle larvae: how much do they need?
Getting the depth wrong is one of the most common mistakes people make with beetle husbandry. The consequences range from undersized adults to dead larvae. The good news is it's easy to get right.
Epibolus pulchripes: keeping the pink leg millipede
Epibolus pulchripes, the pink leg millipede, is one of the more visually striking millipedes in the hobby. Jet black body with vivid pinkish-red legs, and a standout in any collection.
Humidity control: tips and tools
Humidity trips up more new invertebrate keepers than almost anything else. Too dry and your animals desiccate. Too wet and you get mould explosions. The sweet spot depends on what you keep.
Captive bred vs wild caught: responsible breeding matters
The "wild-caught bad, captive-bred good" framing is too simple. The reality depends on the species, the source population, and what the alternative is.
Calcium for isopods: what to use and why it matters
Calcium is probably the single most overlooked element in isopod care. These animals are crustaceans with a calcium carbonate exoskeleton that needs rebuilding after every moult. Without enough, moults fail.
Jumping spider moulting: what to expect
Moulting is the most stressful event in a jumping spider's life, and probably the most stressful event in its keeper's life too. Your spider stops eating, retreats to its sac, and goes silent for days.
Failed moults: causes and prevention
A failed moult is probably the worst thing that can happen to a captive invertebrate. By the time you notice it has gone wrong, there is almost nothing you can do. Prevention is everything.
Understanding humidity and temperature
Temperature and humidity are the two things that kill the most captive invertebrates. Not predators, not disease, not old age. Get these two parameters wrong and it doesn't matter how good your substrate is.
Pupal cells: why you should never disturb them
If you keep beetles long enough, you'll have the urge to dig through substrate and check on a quiet larva. Don't. Disturbing a pupal cell can kill the beetle or leave it permanently deformed.
What do millipedes eat? A complete diet guide
Feeding millipedes is straightforward once you understand what they are: detritivores. They eat dead and decaying plant matter. The trick is making sure they get everything they need from what you provide.
Beetle larvae care: from grub to adult
Most of a beetle's life is spent as a larva. If you're going to keep beetles, you need to get larval care right. Here's what that actually involves.
Setting up a bioactive terrarium with isopods
A bioactive terrarium is an enclosure where living organisms handle the waste. Isopods and springtails do the heavy lifting. The setup takes more thought upfront, but maintenance drops considerably.
Giant African millipede care guide
Archispirostreptus gigas is the millipede most people start with. They get properly big, they're calm enough to handle, and their care isn't particularly complicated once you've got the substrate sorted.
Heating your invertebrate enclosure
A lot of invertebrate heating advice is just reptile advice with the species names swapped out. Most tropical invertebrates do well at 20-26C, which is close to normal room temperature. You may not need supplemental heating at all.
How to handle jumping spiders safely
One of the best things about jumping spiders as pets is that you can actually hold them. A settled jumping spider will walk onto your hand, explore your fingers, and sometimes just sit there watching you.
Best beetle species for beginners
If you're thinking about keeping beetles for the first time, here's an honest rundown of which beetles work well for beginners in the UK, what makes them beginner-friendly, and a couple to avoid until you've got experience.
Millipede moulting: what happens and how to help
If your millipede has disappeared into the substrate and you haven't seen it for a week, don't panic. It's probably moulting. This is the most common source of worry for new keepers.
Mould in your terrarium: when to worry
You set up a new enclosure, get the substrate right, and within a week there is white fuzzy stuff growing on everything. Your first instinct is to tear the whole thing apart. Do not do that.
CITES and the law: what UK keepers need to know
Most people getting into invertebrate keeping do not think about the legal side until they try to buy something and find out it requires paperwork. The actual legal situation in the UK is more straightforward than the rumour mill suggests.
Using isopods as a cleanup crew in reptile tanks
Decomposing organic waste is literally what isopods have evolved to do. They've been breaking down dead plant matter for hundreds of millions of years. Putting them in a reptile enclosure just gives them a specific patch to work on.
Setting up your first terrarium
Getting the enclosure right before the animal arrives is the single most useful thing you can do as a new keeper. An enclosure that's already at the right temperature and humidity gives your animal the best possible start.
Isopod substrate: getting the mix right
Substrate is where your isopods live, eat, breed, moult, and hide. Get the mix wrong and the colony will struggle regardless of everything else you do right. Get it right and the colony largely takes care of itself.
How to sex beetles: telling males from females
Knowing whether your beetles are male or female matters if you want to breed them. The problem is that sexing beetles ranges from dead easy to nearly impossible, depending on the species.
Dealing with mites in isopod colonies
Sooner or later, if you keep isopods, you'll get mites. The first time you spot a fuzzy white coating on your food dish it can feel like the colony is doomed. It usually isn't, but mites are worth understanding properly.
Best millipede species for beginners
There are roughly 12,000 described species of millipede worldwide, but only a handful are commonly available in the UK hobby. Here's what's actually good for beginners and why.
Phidippus audax: the bold jumping spider
Phidippus audax lives in the shadow of its cousin P. regius in the UK hobby, and that's a shame. The bold jumping spider is a cracking little predator that's well worth keeping in its own right.
A guide to substrates for invertebrates
Nobody gets excited about substrate when they start keeping invertebrates. Then they get it wrong. The substrate is not just bedding. For many species, it is their food, their shelter, and the environment their young develop in.
Understanding beetle metamorphosis
Every beetle you've ever seen started life as a soft, pale grub that looked nothing like the finished article. That transformation is one of the most dramatic processes in the insect world.
How to handle millipedes safely
Yes, you can hold millipedes. They're one of the few invertebrates that genuinely tolerate handling, which is a big part of why people keep them. But there's a right way to do it.
Invertebrate conservation: why it matters
When people talk about conservation, they usually mean pandas, tigers, or whales. Invertebrates barely get a mention, despite making up about 97% of all known animal species. That imbalance matters.
Dealing with grain mites
If you keep invertebrates long enough, you will get grain mites. One morning you open a tub and there is a faint dusty sheen on the food dish, or tiny white specks moving across the substrate surface.
Choosing your first pet invertebrate
Your first invertebrate should be something you can actually keep alive. People regularly buy species that look brilliant in photos and then struggle with care requirements they weren't ready for.
Best isopod species for beginners
The sheer number of species available in the UK hobby right now can be overwhelming. Some breed like mad in a plastic tub. Others need very specific conditions and will quietly die off if anything is slightly wrong.
Setting up a beetle enclosure
The enclosure you set up for a beetle depends almost entirely on whether you're housing larvae or adults. They have different needs, and trying to do both in one box usually means doing both badly.
A complete guide to keeping pet millipedes
Millipedes are one of the more straightforward exotic invertebrates to keep, and they're oddly pleasant to watch. They graze through leaf litter, burrow into substrate, and trundle over each other in a way that's somehow relaxing.
A complete guide to keeping isopods
Isopods are crustaceans. That trips people up right away because they look like bugs. They breathe through gill-like pleopods on their underside, which is why humidity matters so much in captivity.
A complete guide to keeping pet beetles
Beetles are the most species-rich order of insects on the planet. Over 400,000 described species, and hobbyists in the UK can legally keep dozens of them. Here's what you need to know before buying your first.
Millipede vs centipede: what's actually different?
People mix these two up constantly. But millipedes and centipedes are about as similar as a cow and a wolf. One eats plants. The other hunts and bites. Getting them confused has consequences.
Getting started with exotic invertebrates
Invertebrate keeping is pretty accessible, and you don't need a spare room or a big budget to get going. But there are a few things worth knowing before you buy anything.
Phidippus regius: the regal jumping spider
They're the poster child of the jumping spider hobby, and honestly, they earned it. Big, curious, and about as close to "interactive" as an arachnid gets.
Isopod colony management: what actually works
Most isopod colonies sort themselves out. But in a sealed plastic tub on your shelf, conditions aren't always right, and colonies can boom and crash in ways that catch you off guard.
How to build a bioactive terrarium
A bioactive terrarium is a self-maintaining enclosure where living organisms break down waste. The substrate stays healthy, mould gets eaten before it spreads, and the whole system ticks along with minimal intervention.
The UK exotic invertebrate hobby in 2026
Ten years ago, if you told someone in the UK you kept pet isopods, they would have looked at you like you had lost it. The hobby has grown properly in the last few years.
How to spot a healthy invertebrate
Buying healthy invertebrates is one of those things that sounds obvious until you are standing in front of a tub at an expo and realise you have no idea what you are looking at.