Catch Cups

Catch cups are one of the simplest and most important tools in any invertebrate keeper's collection, and if you only own one piece of safety equipment beyond the enclosure itself, this should be it. The concept is straightforward -- a clear plastic cup paired with a flat lid, piece of cardboard, or sheet of acrylic that allows you to safely contain and relocate an invertebrate without ever touching it directly. What makes catch cups so valuable is not their complexity but their effectiveness at removing stress from situations that would otherwise require direct hand contact with animals that may be defensive, venomous, or simply too fragile and fast for bare-handed capture.

Every keeper needs to understand catch cups regardless of experience level or the species they maintain. Beginners benefit from the confidence that comes with knowing they have a reliable tool for routine tasks like enclosure cleaning and rehousing. Experienced keepers who work with medically significant species rely on catch cups as their primary line of defense during maintenance. Even household members who never interact with the collection directly should know where the catch cups are stored and how to use one in case an escape occurs while the primary keeper is away.

The importance of catch cups extends well beyond personal safety. When you reach into an enclosure with your hands, you are introducing a large, warm, unfamiliar object into a space the animal considers its territory. Many invertebrates interpret this as a threat and respond with defensive behaviors including biting, stinging, flicking urticating hairs, or bolting in unpredictable directions. A catch cup eliminates this confrontation entirely. The animal walks or is gently guided into a clear container, the lid slides underneath, and the transfer is complete without anyone getting hurt or stressed.

New keepers frequently ask whether catch cups are really necessary for docile species that tolerate handling without complaint. Others wonder whether using a cup somehow makes them less capable as keepers compared to people who handle animals directly. Some worry that the cup itself might injure delicate species. These are reasonable questions, and the short answer is that catch cups are appropriate for virtually every species and every situation where an invertebrate needs to be moved.

This article covers everything you need to know about selecting, using, and maintaining catch cups across the full range of invertebrate species. You will learn which cup sizes and materials work best for different animals, how to execute a calm capture that minimizes stress for the animal, and why the catch cup approach consistently produces better outcomes than direct handling for routine keeper tasks.

The catch cup method works because it cooperates with an invertebrate's natural behavior rather than fighting against it. Most invertebrates respond to perceived threats by moving away, and a catch cup takes advantage of this instinct by gently guiding the animal into an enclosed space where it settles on its own. There is no grabbing, no pinning, and no forced restraint. The animal moves under its own power into the cup, the lid seals the opening, and the keeper has full control of the situation without ever making physical contact. This approach removes the adversarial dynamic that makes direct handling stressful for both parties.

The risk profile of catch cup use is remarkably low compared to any form of direct handling. A clear cup provides a physical barrier between your hands and the animal's defensive mechanisms, whether those include fangs, chelicerae, stingers, urticating hairs, or chemical secretions. The transparency of the cup lets you monitor the animal's position and behavior throughout the process, so you always know exactly where the animal is relative to your fingers. The rigid walls prevent the sudden lateral bolts that catch handlers off guard during bare-handed transfers and cause many bites and stings.

From the animal's perspective, a catch cup encounter is far less traumatic than being picked up by human hands. Invertebrates lack the cognitive framework to understand that a warm, moving hand belongs to a caretaker rather than a predator. The pressure and heat of direct contact trigger defensive responses even in species that appear to tolerate handling, and repeated handling stress accumulates over time in ways that may not be immediately obvious. A catch cup produces a brief period of confinement in a smooth, neutral-temperature container -- a much milder experience than being gripped, lifted, and suspended in open air.

Keepers have both an ethical and practical responsibility to minimize handling stress whenever possible. Ethically, these animals did not choose captivity, and the least we can do is avoid subjecting them to unnecessary fear during routine maintenance. Practically, a stressed invertebrate is an unpredictable invertebrate, and unpredictable behavior is how people get bitten, stung, or stuck chasing an escaped tarantula across the living room floor. Using a catch cup is not a sign of timidity -- it is a sign that you respect the animal enough to handle it on terms that make sense for both of you.

The equipment itself is inexpensive and widely available. Clear plastic deli cups in various sizes work perfectly and can be purchased in bulk from restaurant supply stores or online retailers. Some keepers prefer purpose-built acrylic catch cups with beveled edges that slide more easily under an animal's legs. You will also need flat, rigid lids -- thin acrylic sheets, stiff cardboard, or the lids that come with deli cups all work well. The key requirements are transparency so you can see the animal, rigidity so the container holds its shape during capture, and smooth edges that will not injure delicate legs or appendages.

Having the right size catch cup available before you need it is part of basic emergency preparedness in invertebrate keeping. Keep a range of sizes on hand, from small cups for slings and juvenile specimens to large cups or even clear plastic containers for full-grown tarantulas and large scorpions. Store them near your enclosures where you can grab one quickly. If an escape happens or you need to intervene during feeding, the last thing you want is to be rummaging through kitchen cabinets looking for an appropriately sized container while a fast-moving centipede explores your desk.

Catch cup technique varies meaningfully across different invertebrate groups, and understanding these differences makes the process smoother for everyone involved. Tarantulas are perhaps the most common application, and most keepers develop their catch cup skills with these animals first. For terrestrial tarantulas, you place the cup in front of the animal and gently guide it forward with the lid held behind. Most tarantulas will walk into the cup on their own once they realize the path of least resistance leads into the container. Arboreal species require a different angle since they tend to climb upward when startled, so positioning the cup above and guiding downward with the lid often works better.

Scorpions present their own considerations because they tend to back away from threats and may stand their ground with pincers raised rather than fleeing into an available container. Patience matters here more than speed. A slow, deliberate approach with the cup lowered over the scorpion from above -- rather than trying to scoop from the front -- generally produces the calmest captures. Once the cup is over the animal, slide the lid underneath carefully, giving the scorpion time to lift its legs and settle rather than forcing the lid against its body.

Centipedes demand the highest level of catch cup proficiency because they are fast, unpredictable, and many species carry medically significant venom. You do not get second chances with a large centipede outside its enclosure. The cup needs to come down quickly and decisively, and you need to be prepared for the animal to run in any direction at speed. Keep the lid ready in your other hand and slide it under the cup immediately once the centipede is contained. Many experienced keepers practice their cup technique on slower, less dangerous species before working with large centipedes.

Insects like mantises and stick insects require gentler catch cup work because their legs and antennae are fragile and easily damaged by clumsy cup placement. Use cups with smooth, rounded rims and take extra care when sliding the lid underneath to avoid catching thin appendages. For very small or delicate specimens, soft paintbrushes can be used to gently encourage the animal into the cup without any physical pressure from rigid tools.

Aquatic and semi-aquatic invertebrates including hermit crabs, crayfish, and large snails can also be managed with catch cup principles adapted to their environments. Hermit crabs retract into their shells when threatened, so a cup placed over a retracted crab and left still for a few minutes allows the animal to relax before you slide a lid underneath and move it. Crayfish require careful attention to their claws and the backward escape reflex -- approaching from behind while the animal faces away from you reduces the chance of a pinch.

Before you begin any catch cup operation, take a moment to assess the situation and set yourself up for a calm, controlled interaction. Know where the animal is in the enclosure, have your cup and lid ready in hand, and clear the area around the enclosure of anything that could complicate matters if the animal moves unexpectedly. Close doors and windows in the room, remove pets, and make sure you have a clear path to wherever the animal needs to go next. These thirty seconds of preparation prevent most of the problems that turn simple rehousing into chaotic chases.

The actual capture technique depends on whether you are working inside an enclosure or dealing with an animal on an open surface. Inside an enclosure, you generally remove hides and decorations first to give yourself a clear field, then place the cup in front of the animal and use the lid as a gentle backstop to encourage forward movement. On an open surface such as a table or floor, the cup comes down over the animal from above in a smooth, steady motion -- not a panicked slam, but not so slow that the animal has time to bolt from under the rim.

Once the animal is in the cup with the lid sealed underneath, you have all the time in the world. There is no rush at this point. Let the animal settle for a minute before moving, then carry the cup steadily to its destination. When releasing into a new enclosure, set the cup on its side inside the enclosure with the lid removed and let the animal walk out on its own terms. This final step matters because dumping an invertebrate out of a cup is just as stressful as grabbing it by hand -- the whole point of the catch cup approach is cooperation, not just containment.

Make catch cups part of your household safety protocol, not just your personal routine. Show family members and anyone who pet-sits for you how the cups work, where they are stored, and what to do if they find an invertebrate outside its enclosure. A laminated card near the enclosures with simple instructions can save enormous stress during an unexpected escape when the primary keeper is not home.

If an animal is bitten or stung despite using catch cups, or if you are dealing with a species whose venom profile concerns you, seek professional medical attention promptly. Catch cups reduce risk dramatically, but they do not eliminate it entirely, and having a plan for the rare occasion something goes wrong is simply responsible keeping.

The most common catch cup mistake is simply not having one ready when you need it. Keepers who rely on direct handling for routine tasks eventually get comfortable enough that they skip the cup for quick jobs -- just lifting the water dish, just moving the tarantula an inch so you can clean behind a hide. That casual attitude is exactly how experienced keepers end up with bites they could have easily prevented. Keep cups stored right next to your enclosures and make reaching for one an automatic reflex, not something you have to consciously decide to do.

Using the wrong size cup causes problems that keepers often do not anticipate. A cup that is too small forces a tight fit that presses against the animal's legs and body, causing stress and potential injury. A cup that is too large gives fast species too much room to run circles inside the container, making the lid-sliding step difficult and unpredictable. Match the cup diameter to the animal's leg span -- you want enough room for the animal to sit comfortably without being able to build up running speed.

Rushing the capture is probably the second most frequent error after not using a cup at all. Keepers who slam the cup down quickly tend to clip legs, startle the animal into a threat posture, or miss entirely and create an escape situation that is now more dangerous because the animal is frightened and running. Smooth and deliberate beats fast every time. The animal is not going to outrun a cup that is already positioned correctly -- take the extra second to place it rather than swinging it like you are trying to catch a fly.

Forcing an animal out of a catch cup rather than letting it leave on its own terms undermines the entire purpose of using the cup in the first place. Shaking, tapping, or blowing into the cup to hurry the animal along creates exactly the kind of stress you were trying to avoid. Set the cup down in the destination enclosure, remove the lid, and walk away. The animal will leave when it is ready, and that patience is what makes the catch cup approach genuinely cooperative rather than just a slightly gentler form of forced handling.

Neglecting to teach other household members about catch cups is a safety gap that becomes obvious only when it matters most. If your partner, roommate, or child discovers an escaped invertebrate and has no idea how to safely contain it, the likely outcome involves panic, improvised tools, and either a hurt person or a hurt animal. Five minutes of demonstration and a clearly labeled cup stored in an accessible location turns a potential emergency into a manageable situation for anyone in the household.

Catch cups represent the single most effective safety tool available to invertebrate keepers, and their value lies in their simplicity. A clear plastic cup and a flat lid eliminate direct contact with defensive animals, reduce stress for the animal during transfers, and give keepers confident control over situations that would otherwise involve risk. There is no species too docile to benefit from catch cup use and no keeper too experienced to need one. Making the cup your default tool for every interaction where an animal needs to move is the foundation of safe invertebrate keeping.

The underlying principle is cooperation rather than confrontation. When you use a catch cup, you are working with the animal's instinct to move away from a perceived threat and into an enclosed space. You are not pinning it, grabbing it, or overpowering it. This distinction matters because it changes the dynamic from adversarial to collaborative -- the animal does most of the work, and both parties come through the interaction without injury or lasting stress. Adopting this mindset across all your husbandry practices makes you a better keeper.

General catch cup knowledge gets you started, but species-specific technique is what keeps you safe over the long term. A tarantula, a scorpion, and a centipede all require different approaches to cup capture, and the differences are not trivial. Research the defensive behavior and movement patterns of your specific species so you know what to expect before you open the enclosure. The time to learn how a particular animal reacts to a catch cup is not during your first attempt with a species you have never worked with.

Keep catch cups accessible, sized appropriately for your collection, and part of your household safety plan. Teach everyone who lives with you or cares for your animals how to use them. Replace cups that become scratched or opaque since visibility is the whole advantage. Treat the catch cup as what it is -- not a beginner's crutch but a professional tool that experienced keepers reach for first, every time, because it works better than hands for the vast majority of invertebrate interactions.