Bug Pets: A Beginner's Guide to Keeping Invertebrates

Keeping live invertebrates as pets — beetles, mantids, stick insects, millipedes and isopods — has quietly become one of the UK's fastest-growing corners of the pet world. They're quiet, compact, inexpensive and genuinely fascinating to watch. This guide covers what "bug pets" are, whether they suit your lifestyle, which species make good starting points, the basics of their care, and the safety, ethical and legal points worth knowing before you buy.

What Are Bug Pets?

Bug pets are live invertebrates kept as companion animals in controlled home enclosures: insects, arachnids, myriapods and crustaceans. Think stick insects perched on bramble, an iridescent beetle burrowing through substrate, or isopods scuttling across leaf litter. The category spans a surprisingly broad range — insects (beetles, mantids, stick insects, cockroaches), arachnids (tarantulas, scorpions), myriapods (millipedes, centipedes) and crustaceans (isopods, the woodlice and "pill bugs" that are part of our growing hobby).

What sets them apart from conventional pets is how little they ask of you. Many species thrive in an enclosure the size of a shoebox, some cost only a few pounds, and daily care is often five to ten minutes. The trade-off is that they need precise conditions — the right humidity, temperature and substrate — rather than the rough-and-ready tolerance of a cat or dog. Lifespans vary widely too, from a few months for an adult beetle to several years for a tarantula.

Are Bug Pets Right for You?

It's worth an honest think before you order any livestock. Most species need only a shelf-sized terrarium (around 10–30 litres), but you'll want space for any heating equipment and substrate. Day to day, can you commit to misting, temperature checks and a weekly look-over? Some species need live food — crickets, roaches or fruit flies — so you'll need to be comfortable handling those. And it's worth setting expectations: many bug pets are observation animals rather than handling pets, and direct handling can stress or harm them.

They suit families with children (with adult supervision for feeding and maintenance), adult hobbyists who enjoy detailed husbandry and breeding projects, and classrooms studying life cycles and ecology. The upsides are real: they're silent, nearly odourless when kept properly, endlessly watchable, and cheap to set up. The honest downsides are that some species are fragile and short-lived, carnivorous species need a supply of live prey, most can't be handled enjoyably, and live animals need careful, well-timed shipping in cold weather.

Popular Types of Bug Pets

Beetles

Beetles are among the most visually striking options. The Rainbow Stag Beetle (Phalacrognathus muelleri) shows iridescent green and red and reaches 4–7 cm; Dorcus titanus can exceed 8 cm with formidable mandibles; and the UK-native Stag Beetle (Lucanus cervus) has the famous antler-like jaws. Beetle keeping has an unusual rhythm — larvae spend one to three years developing in decaying wood before pupating into adults that may live only a few months — which appeals to people who enjoy a long-term project.

Mantids

Praying mantids are ambush predators with real visual appeal: the Orchid Mantis (Hymenopus coronatus) mimics flower petals, the Ghost Mantis (Phyllocrania paradoxa) resembles a dead leaf, and adults typically reach 5–8 cm. They need live prey (fruit flies for nymphs, crickets and locusts for adults) and consistent humidity, so they're hands-on rather than hands-off — but their hunting behaviour makes them endlessly watchable.

Stick and Leaf Insects

For supervised children and absolute beginners, stick insects are often the ideal first choice. The Indian Stick Insect (Carausius morosus) reproduces parthenogenetically — females lay fertile eggs without males — making colonies very easy to maintain, and the Giant Prickly Stick Insect (Extatosoma tiaratum) grows to 15 cm and tolerates gentle handling. These herbivores eat bramble, ivy and oak, which you can forage for free in most UK gardens.

Isopods

Isopods have exploded in popularity as both pets and cleanup crews for bioactive terrariums. Species like the Rubber Ducky, various Armadillidium and colourful Porcellio morphs breed readily in captivity and come in striking colour variations — orange, purple, spotted, striped. At roughly 1–3 cm they're small, eat decaying organic matter, and need little more than leaf litter, a calcium source and consistent humidity, which makes them one of the easiest entry points into the hobby. You can see the full range of colourful species worth keeping in our guide.

Advanced Options

Tarantulas and scorpions are the hobby's advanced tier. Some, like the Chilean Rose Tarantula (Grammostola rosea), are widely considered docile and beginner-friendly, but others can deliver medically significant bites or stings, and some regions restrict keeping them by law. Research thoroughly before considering these.

Basic Care Requirements

This is a high-level overview — detailed care varies a lot by species, so always verify the specific needs of any animal before you buy it.

Enclosure. Use a secure, well-ventilated plastic or glass container with a mesh or ventilated lid. As a rough guide, allow at least three times the animal's body length in width and height. Vertical space matters for climbers like mantids and stick insects; horizontal space suits ground-dwellers like beetles and isopods, especially if you're keeping isopods with live plants in a bioactive setup.

Substrate. Coco fibre holds humidity well and suits tropical species; leaf litter feeds and shelters detritivores; rotten wood is essential for beetle larvae; plain paper towel works for temporary or quarantine housing; and combination soil mixes suit isopods and millipedes, forming the basis of the best setups for planted terrariums.

Temperature and humidity. This is where species differ most: tropical beetles around 22–26°C and 60–80% humidity; temperate species cooler at 15–20°C with lower humidity; most mantids 22–28°C depending on origin; and isopods at room temperature (18–24°C) with a 70–80% moist zone. An inexpensive digital thermometer-hygrometer prevents most humidity-related problems.

Feeding. Herbivores like stick insects need fresh bramble, oak or ivy replaced every two to three days. Detritivores like beetles and isopods take leaf litter, decaying wood and vegetables, with cuttlebone for calcium. Carnivores like mantids need appropriately sized live prey. Across all of them, remove uneaten fresh food within a day or two to prevent mould, spot-clean weekly, check lids and ventilation, and watch for mites or mould as signs of excess moisture — at which point it's worth knowing how your cleanup crew manages itself.

Safety, Ethics and the Law

Bug pets are living animals and deserve humane, responsible care throughout their lives.

Safety. Beginners and families with children should steer clear of venomous or medically significant species — some Old World tarantulas and certain scorpions can deliver painful or dangerous bites and stings. Start with established beginner species and build experience first.

Allergy and hygiene. Some people react to proteins in feeder insects, and frass (insect waste) can trigger sensitivities in enclosed spaces. Wash your hands after handling enclosures or feeders, and work somewhere well-ventilated when maintaining colonies.

The law. In the UK you must never release non-native species into the wild — this is covered by Invasive Alien Species regulations and matters as much for an unwanted stick insect colony as for anything larger. Some species need CITES documentation to import or export, and rules differ from country to country, so check before buying anything that has to cross a border.

Sourcing and rehoming. Buy captive-bred animals from sellers who are clear about the origin of their stock, and avoid wild-caught specimens from threatened habitats. Never release surplus feeder insects outside, and if you can no longer care for a colony, rehome it through local keepers or hobbyist communities rather than releasing it.

Why People Love the Hobby

Beyond their looks, bug pets connect people to biology in a way few hobbies manage. Watching a beetle progress from egg to larva to pupa to adult brings textbook metamorphosis to life, which is why stick insects and beetles are such common classroom animals — they map neatly onto school biology topics around life cycles, habitats and classification, and isopods make an easy, low-risk addition once a class has the basics.

Many keepers also find the hobby quietly calming. The slow movements of a stick insect or the patient stalking of a mantis reward focused observation, and keeping simple records — moult dates, breeding events, temperature and humidity logs, photos of growth and colour change — turns casual keeping into a genuine ongoing project. The community is welcoming too, sharing everything from substrate recipes to species identification, and happy to point newcomers toward good starter species.

Getting Started

Bug pets are a genuinely rewarding hobby for anyone willing to research a species' needs and keep its conditions consistent. The advice that serves people best is simple: start small, choose a beginner-friendly species, source from an ethical supplier, and stay curious. What begins as a single stick insect or a starter culture of isopods often grows into a multi-species collection that keeps you learning for years.

Frequently Asked Questions

What is the easiest bug pet for beginners?

Stick insects and isopods are the usual starting points. Stick insects reproduce easily and eat foraged bramble and oak; isopods need only leaf litter, calcium and consistent humidity. Both are low-maintenance and forgiving of small mistakes.

Can bug pets be handled?

Some can — certain stick insects and a few docile species tolerate gentle handling — but many are observation-only, and handling can stress or injure them. It's best to treat most bug pets as animals to watch rather than hold.

Are bug pets legal to keep in the UK?

Most popular species are, but you must never release non-native invertebrates into the wild under Invasive Alien Species regulations, and some species need CITES documentation to import or export. Always check the rules for a specific species before buying.

How much space do bug pets need?

Very little — most thrive in a shelf-sized enclosure of around 10–30 litres. As a rough rule, allow at least three times the animal's body length in width and height, with vertical space for climbers and floor space for ground-dwellers.

Do bug pets smell or make noise?

No — kept properly they're nearly odourless and silent, which is a large part of their appeal. Smell usually only becomes an issue if uneaten food or waste is left to build up, so regular spot-cleaning keeps things fresh.

Are isopods a good first bug pet?

Yes — they're among the easiest. They eat decaying matter, need only basic humidity and a calcium source, breed readily, and double as a cleanup crew in bioactive setups, making them a popular and forgiving entry point.