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What Is Insect Collecting?

Insect collecting is the practice of finding, capturing, preserving, and organizing insect specimens for scientific study, education, or personal interest. It’s one of the oldest forms of natural history — people have been pinning beetles and pressing butterflies since at least the 1600s — and it remains one of the most accessible ways to connect with the natural world.

There are roughly 1 million described insect species on Earth, and entomologists estimate the actual number could be 5 to 10 million. That means the majority of insect species haven’t even been named yet. Every time a collector pins an unfamiliar specimen, there’s a real chance it’s something nobody has ever formally described. That possibility alone makes insect collecting one of the few hobbies where an amateur can still make genuine scientific contributions.

A Brief History of Pinning Things

Insect collecting as a formal practice traces back to the Renaissance, when European naturalists began assembling “cabinets of curiosities” — collections of natural objects meant to showcase the diversity of the natural world. By the 1700s, collecting had become systematic.

Carl Linnaeus — the Swedish botanist who invented the binomial naming system still used today — was an avid insect collector. His students fanned out across the globe, shipping specimens back to Uppsala. Many of the insect species names Linnaeus assigned in the 1758 edition of Systema Naturae are still in use, making those 260-plus-year-old specimens the official reference points (called “type specimens”) for their species.

The Victorian era was the golden age of insect collecting. Charles Darwin, Alfred Russel Wallace, and Henry Walter Bates were all passionate beetle collectors. Darwin once famously wrote about finding three rare beetles under bark, popping one in his mouth to free a hand for the third (the one in his mouth secreted a foul liquid — he lost all three). Wallace collected over 100,000 specimens during eight years in the Malay Archipelago, describing hundreds of new species.

This wasn’t just hobbyist enthusiasm. The specimens these collectors gathered formed the foundation of evolutionary biology. Wallace’s observations of insect distribution across island chains directly contributed to his independent development of natural selection theory. Bates discovered the phenomenon now called Batesian mimicry — where harmless species evolve to resemble dangerous ones — entirely through careful collecting and comparison of butterfly specimens.

Why Collect Insects Today?

In an age of smartphones and DNA barcoding, why would anyone still stick pins through beetles? Several reasons.

Scientific Documentation

Physical specimens remain the gold standard for species identification and description. A photograph can’t be dissected to examine genitalia (often the only way to distinguish closely related species). A DNA sample can’t show wing venation patterns or the exact shade of a color pattern. Pressed, pinned, or alcohol-preserved specimens can be re-examined indefinitely as new identification techniques develop.

The Smithsonian’s National Museum of Natural History holds over 35 million insect specimens. The Natural History Museum in London has about 34 million. These collections are irreplaceable scientific resources — researchers use them to track species distributions over time, study the effects of climate change, identify agricultural pests, and discover new species.

Biodiversity Monitoring

Insect populations are declining globally. A widely cited 2017 study from Germany found a 75% decline in flying insect biomass over 27 years at protected areas. Documenting what’s out there — before it’s gone — has taken on new urgency.

Collecting programs like BioBlitzes (intensive biological surveys of specific areas) rely on collectors to quickly capture, identify, and catalog insect diversity. Citizen scientists with collecting skills contribute meaningfully to ecology research that professional entomologists alone couldn’t accomplish.

Education

There’s nothing quite like examining a real insect specimen under magnification to understand morphology. The difference between looking at a picture of a beetle and actually seeing the microscopic sculptured surface of its elytra (wing covers) is enormous. University entomology courses almost universally require students to build personal insect collections, and there’s a reason — the process of collecting, identifying, and curating specimens teaches observational skills that no textbook can replicate.

Personal Fascination

Let’s be honest — insects are just cool. A metallic green tiger beetle that can run 5.6 mph (the human equivalent of about 300 mph). A praying mantis that can snatch a fly out of the air in 50 milliseconds. A hercules beetle with horns longer than its body. Once you start looking closely at insects, you can’t stop noticing how bizarre and beautiful they are.

How to Collect: Methods and Equipment

Different insects require different approaches. Here’s how collectors actually work.

Aerial Netting

The classic image of an entomologist — person with a big net chasing butterflies — is cliche but real. Aerial nets have a lightweight mesh bag on a metal ring attached to a handle. You swing the net to capture flying insects, then fold the bag to trap them inside.

The technique is straightforward for large, slow butterflies. For fast-flying dragonflies or tiny parasitic wasps, it takes genuine skill. Experienced collectors develop an almost unconscious ability to anticipate flight paths and time their swings.

Sweep Netting

A sweep net is sturdier than an aerial net, with a canvas or heavy muslin bag designed to be swept through vegetation. You walk through a meadow or along a hedgerow, sweeping the net back and forth through plants. What you catch is astonishing — hundreds of tiny beetles, bugs, flies, wasps, and spiders that you’d never see just looking at the plants.

Sweep netting is probably the most productive general collecting method. Ten minutes of sweeping in a diverse meadow can yield dozens of species.

Light Trapping

Many nocturnal insects are attracted to light — moths especially, but also beetles, lacewings, caddisflies, and dozens of other groups. A basic light trap is just a bright light (mercury vapor or UV) hung in front of a white sheet. Insects land on the sheet, and you pick off what you want.

Serious moth collectors use battery-powered UV lights with bucket traps that capture moths alive and unharmed. A single night of light trapping in a good location during summer can attract hundreds of species. The sheer diversity visible at a light trap on a warm June night is genuinely jaw-dropping.

Pitfall Traps

For ground-dwelling insects — ground beetles, rove beetles, ants — pitfall traps are simple and effective. Dig a hole, sink a cup into it so the rim is flush with the ground, add a preservative (propylene glycol works well and is relatively non-toxic), and check it periodically. Ground-active insects walk across the surface, fall in, and are preserved.

Malaise Traps

Named after Swedish entomologist Rene Malaise (not the English word), Malaise traps look like tents with an opening at the bottom. Flying insects enter, can’t figure out how to leave, fly upward toward the light, and end up in a collecting bottle at the top. These traps run continuously and can collect thousands of specimens per week.

Malaise traps have been instrumental in revealing insect diversity. A single Malaise trap running for a year in a tropical forest can capture tens of thousands of specimens representing hundreds of species — many of them undescribed.

Specialized Techniques

Some insects require specialized approaches. Aquatic insects need dip nets and kick screens in streams. Bark beetles require prying off bark with a knife. Dung beetles, unsurprisingly, are found in dung. Leaf miners need to be reared from leaves. Some parasitic wasps can only be obtained by collecting and rearing their host insects.

The diversity of collecting techniques mirrors the diversity of insects themselves. Every habitat niche has its own insect fauna and its own collection method.

Preserving Specimens

Collecting an insect is only half the work. Preserving it properly is what makes it scientifically useful.

Killing and Relaxing

Most collected insects are killed using ethyl acetate in a killing jar — a glass jar with the chemical absorbed into plaster in the bottom. The insect goes into the jar, the fumes take effect within minutes, and the specimen is ready for processing. For soft-bodied insects, 70-95% ethanol is the standard preservative.

Dried specimens that have stiffened can be relaxed in a humidity chamber (a sealed container with damp paper towels) for a day or two, making them flexible enough to position properly.

Pinning

The most iconic preservation method. Insect pins are specialized — thinner than sewing pins, made from stainless steel, and available in several sizes. The pin goes through the thorax (middle section) of the insect, positioned to the right of center so the left side is available for examination.

The insect is pushed about two-thirds of the way up the pin, leaving room below for labels. Small insects that would be destroyed by a pin are instead glued to a small triangular card (called a point) that’s then placed on a pin.

Butterflies and moths require spreading — their wings are carefully positioned on a spreading board with strips of paper holding them in place while they dry, which takes about a week. A well-spread butterfly is a thing of beauty. A poorly spread one is heartbreaking.

Labeling

This might be the most important part. A specimen without data is scientifically worthless — just a pretty bug with no context. Every specimen gets at least two labels: a locality label (where and when it was collected, by whom) and an identification label (what it is).

The locality label is critical and should include: country, state/province, county, specific location, GPS coordinates (increasingly standard), date, collector’s name, and collection method. Without this information, the specimen can’t contribute to distributional or ecological studies.

Storage

Pinned specimens are stored in airtight boxes or drawers with foam bottoms. Museum collections use standardized Cornell drawers in steel cabinets. Home collectors can use Schmitt boxes or even cigar boxes with foam. The enemies of stored specimens are moisture (which causes mold), dermestid beetles and book lice (which eat dried specimens), and light (which fades colors).

Alcohol-preserved specimens (soft-bodied insects, larvae) are stored in glass vials with tight-fitting caps. The alcohol must be topped off periodically as it evaporates.

Identification: The Real Challenge

Catching insects is fun. Identifying them is hard. There are roughly 1 million described species, and many look nearly identical to the untrained eye.

Starting Out

Beginners should aim for order-level identification first. Learning to distinguish a beetle (Coleoptera) from a true bug (Hemiptera) from a fly (Diptera) is the essential first step. With practice, you’ll start recognizing families — knowing a ladybug from a longhorn beetle from a leaf beetle.

Field guides are available for popular groups like butterflies, dragonflies, and large beetles. For most insect groups, identification beyond family level requires specialized keys — technical documents that walk you through a series of choices based on morphological features.

Microscopy

For many insect groups, a dissecting microscope is essential. Tiny wasps, flies, and beetles often can’t be identified without examining features invisible to the naked eye — wing venation, body sculpturing, antenna segments, genitalic structures. A decent stereo microscope (20x-40x magnification) opens up a world of detail that transforms identification from guessing to science.

Getting Help

Nobody identifies everything alone. The entomology community is remarkably collaborative. Online forums like BugGuide.net, iNaturalist, and various Facebook groups connect collectors with experts who can help with identifications. Museum curators often welcome inquiries from serious collectors.

For difficult groups, specimens may need to be sent to specialists. A parasitic wasp expert might be one of three people in the world who can identify specimens in a particular genus. This level of specialization is both the beauty and the bottleneck of insect taxonomy.

The Ethics of Collecting

Insect collecting raises legitimate ethical questions that deserve honest discussion.

Impact on Populations

The honest answer: for common species, collecting has no measurable population impact. A female housefly can produce 500 eggs. A queen ant can lay millions in her lifetime. Removing a few hundred individuals from a population of millions is biologically insignificant.

For rare and endangered species, the calculus is different. Collecting the last few individuals of an endangered butterfly for your personal collection would be both harmful and likely illegal. Responsible collectors know their local protected species lists and leave rare species alone — or collect only with proper scientific permits.

The real threats to insect populations are habitat loss, pesticide use, light pollution, and climate change — not collecting. A 2019 review in Biological Conservation estimated that 40% of insect species are declining, and the main drivers were agricultural intensification and urbanization.

Killing vs. Photographing

Some people argue that insects should only be photographed, never collected. Photography has its place — it’s excellent for common, easily identified species and for engaging the public with insect diversity. But it can’t replace collecting for scientific purposes.

Many insects simply can’t be identified from photographs. Features like the number of antenna segments, the presence or absence of tiny spines, or the shape of internal genitalia require physical examination. A photograph of a small fly is often just a blurry blob. A preserved, labeled specimen is a permanent scientific record that can be re-examined indefinitely.

Ethical Guidelines

The Entomological Society of America and other professional organizations have published collecting guidelines. The basics: collect only what you need, don’t overcollect at any single site, avoid collecting during population bottlenecks (like early spring when populations are lowest), obtain permits where required, share data and specimens with the scientific community, and never collect protected species without authorization.

How Collections Advance Science

The scientific value of insect collections goes far beyond stamp-collecting with legs.

Climate Change Tracking

Museum specimens collected over decades or centuries document how species distributions have shifted over time. Comparing where a species was found in 1920 versus 2020 reveals range shifts driven by climate change. This kind of long-term data simply doesn’t exist without physical collections.

Agricultural Pest Management

Identifying agricultural pests accurately is the first step in managing them. Collections of pest species and their natural enemies (parasitoids, predators) are essential references for integrated pest management programs. When a new invasive pest appears, collections help determine where it came from and what might control it.

DNA and Molecular Studies

Modern techniques can extract DNA from specimens collected decades ago. This means historical collections are molecular time capsules — researchers can study genetic changes in populations over time, track the spread of invasive species, and resolve taxonomic puzzles that morphology alone couldn’t solve.

Discovering New Species

New insect species are described every day — literally. About 7,000 to 10,000 new insect species are formally described each year, and the pace isn’t slowing. Many of these “new” species have been sitting in museum collections for years, waiting for a specialist to examine them. Others come from fresh collecting expeditions to understudied regions.

The deep sea has nothing on a tropical rainforest canopy for undiscovered biodiversity. Fogging the canopy of a single tropical tree with insecticide — a technique pioneered by Terry Erwin in the 1980s — can yield hundreds of beetle species, a significant percentage of which may be new to science.

Getting Started: Practical Advice

If this has piqued your interest, here’s how to begin.

Start in your backyard. You don’t need to travel to exotic locations. A typical suburban yard in the eastern United States might harbor 500 to 1,000 insect species. Most of them, you’ve never noticed.

Begin with easy groups. Butterflies, dragonflies, and large beetles are satisfying because they’re big, colorful, and have good field guides available. As your skills develop, you’ll naturally gravitate toward whichever group fascinates you most.

Join a community. Local entomological societies, university extension programs, and online communities provide mentorship, identification help, and collecting companions. The ecology of learning is social — people learn faster from other people.

Keep meticulous records. Label every specimen with location, date, and collector. A beautiful specimen with no data is scientifically worthless. An ugly specimen with good data is a permanent contribution to knowledge.

Invest in a microscope. A basic stereo microscope (available used for $100-300) transforms insect identification from frustrating to revelatory. You’ll see structures you never knew existed.

Key Takeaways

Insect collecting is the practice of finding, preserving, labeling, and organizing insect specimens for scientific, educational, or personal purposes. It has a 400-year history intertwined with the development of biology, ecology, and evolutionary theory. Modern collections contain billions of specimens that serve as permanent records of biodiversity, climate change, species distribution, and genetic history.

The practice requires knowledge of collecting techniques, preservation methods, identification skills, and ethical guidelines. For common species, collecting has negligible population impact — the real threats to insects are habitat destruction and pesticide use. For rare species, permits and restraint are essential.

Whether you’re a professional entomologist cataloging tropical diversity or a curious kid with a net in the backyard, insect collecting connects you to the natural world in a way that screens and photographs simply can’t match. There are millions of species out there, most of them unnamed, and the net is waiting.

Frequently Asked Questions

Is insect collecting legal?

In most places, collecting common insects on public land for personal or educational use is legal. However, collecting in national parks, nature reserves, or protected areas usually requires permits. Some species are legally protected — like certain butterflies and beetles — and collecting them without authorization can result in serious fines. Always check local regulations before collecting.

Does insect collecting harm insect populations?

For the vast majority of species, responsible collecting has negligible impact on populations. Insects reproduce in enormous numbers — a single housefly can produce 500 eggs in a lifetime. The threats to insect populations come from habitat destruction, pesticide use, and climate change, not from collecting. That said, rare and endangered species should never be collected without scientific justification and proper permits.

How long do preserved insect specimens last?

Properly preserved and stored insect specimens can last hundreds of years. Museum collections contain specimens from the 1700s that are still in excellent condition. The keys are thorough drying, protection from humidity, and defense against dermestid beetles and other pests that eat dried specimens. Many collections use naphthalene or paradichlorobenzene to deter pests.

What equipment do I need to start collecting insects?

A basic starter kit includes an aerial net (for flying insects), a beating sheet or sweep net (for vegetation), killing jars with ethyl acetate, insect pins (size 0-3), a spreading board for butterflies, foam-bottomed storage boxes, and labels. You can get started for under $100. More specialized equipment — light traps, Malaise traps, pitfall traps — comes as your interest grows.