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Build an Avicularia or Caribena sling enclosure around three priorities: vertical climbing space, cross-ventilation, and controlled access to moisture. A small, escape-proof container with a vertical cork anchor, optional foliage, and a carefully managed water source gives a sling somewhere to climb and build a retreat without turning the enclosure into a stagnant, saturated box.
There is no single proven size or watering routine for every sling. The dimensions and moisture methods below come from different keeper and care-sheet approaches, so use them as starting points and adjust to the individual spider, container airflow, and how quickly the enclosure dries.
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What an Avicularia or Caribena sling enclosure needs
Avicularia and Caribena are arboreal New World tarantulas. They use height, climbing surfaces, and elevated retreat sites rather than a broad terrestrial floor. The Royal Veterinary College’s December 2024 general tarantula-care guidance likewise describes Avicularia avicularia as arboreal and recommends tall enclosures with climbing furniture for arboreal species.
For a sling, the enclosure should provide the following at the same time:
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- Usable vertical space: enough height for the spider to climb and attach silk above the floor.
- A web anchor: a piece of cork bark, with optional silk or plastic foliage, gives the sling a surface around which it can make a tube or retreat.
- Cross-ventilation: air should enter and leave through openings on different faces of the container. Airflow matters more than chasing a numerical humidity target.
- Escape security: every hole, lid seam, and cable or nail penetration must be smaller than the sling and firmly closed.
- Manageable moisture: provide water or damp material according to the chosen method, but avoid a permanently wet, stagnant interior.
- Simple, stable furnishings: cork and foliage should stay fixed and should not block the ventilation pattern.
Northwest Zoological Supply’s arboreal guide describes Avicularia and Caribena as similar in their use of vertical foliage, cork, and silk-tube retreats. Its advice, like the other care sheets, is practical husbandry guidance rather than a controlled comparison of enclosure designs.
Choose a container that fits the individual sling
The container should be small enough that the spider can find prey and water, yet tall enough to use an anchored climbing surface. Oversizing can make observation and feeding harder; undersizing can leave no room for a retreat or make furnishings press against the lid.
| Container approach | Published example | What it offers | Important qualification |
|---|---|---|---|
| Clear drilled box, 100C | 2-5/16 × 2-5/16 × 4-3/16 inches | Compact vertical format for a half-inch sling; easy to add a cork anchor and cap | Ratmosphere’s July 24, 2025 article presents this as one keeper’s method, not a universal size rule |
| Clear drilled box, 105C | 4 × 4 × 7-1/4 inches | More height and working room as the spider grows toward a larger sling or juvenile stage | Also a keeper example; the article names the seller’s comparable 100C product as M100 from TAP Plastics |
| Ventilated insect-lid deli cup | 24-ounce cup for a small second-instar Avicularia | Ready-made perforated lid and a tall, lightweight format | Northwest Zoological Supply calls this its preferred style for young arboreal tarantulas; the guide does not make 24 ounces a requirement |
These examples differ substantially, and no source establishes a formula based on leg span. Measure the actual interior after adding cork: the sling needs a clear vertical route and a retreat surface, not merely an empty volume printed on the package.
When to move to a larger enclosure
Plan the next container before the current one becomes cramped. The 105C example is taller and wider than the 100C, but growth alone is not a precise trigger. Rehouse when the sling can no longer climb and turn around without contacting the lid or furnishings, when the retreat occupies most of the usable space, or when routine maintenance repeatedly disturbs the spider because access is too tight.
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Materials for a simple sling build
- A clear, vertically oriented plastic enclosure or ventilated insect-lid cup with a lid that closes positively.
- A drill and a 1/16-inch bit for a drilled-box build.
- A tall, dry piece of cork bark sized to fit without wedging the lid open.
- Optional silk or plastic foliage for extra climbing and web-anchoring points.
- A small amount of coconut coir or another chosen substrate; Northwest Zoological Supply specifically names coir and damp sphagnum in its young-arboreal examples.
- A small water cap or dish if using a dish-based routine.
- A clean wire nail or similar support only if it can be installed securely and cannot leave a sharp, exposed point.
Furnishings are functional, not decorative. Keep the cork and foliage stable, leave the ventilation openings clear, and make sure no piece can fall onto the sling when the container is moved.
How to build the enclosure step by step
1. Prepare and inspect the empty container
- Wash and dry the container, then examine the lid, hinges, corners, and seams for gaps.
- Close the lid and test it from every side. A sling should not be able to push it open or reach a gap at the rim.
- Mark the planned ventilation points before drilling. Work with the enclosure empty so plastic shavings cannot remain with the spider.
2. Drill a cross-ventilation pattern
- Use the 1/16-inch bit from the keeper example to make small openings around the side walls. Put openings on opposing or adjacent faces so air can move through the enclosure rather than entering and stopping at one wall.
- Deburr each hole and remove every plastic shaving. Run a clean fingertip or cotton swab around the inside and outside of each opening to find sharp edges.
- Inspect the finished holes against the actual sling. Hole count and spacing must be determined by escape security and airflow; Ratmosphere’s mention of 12 holes on each side is that keeper’s personal practice, not a validated specification.
If you use a ready-made insect-lid cup, inspect the perforations in the same way. A pre-ventilated lid is convenient, but it still has to be escape-proof for the particular sling.
3. Install the vertical anchor
- Place a tall cork section so it creates a continuous route from the floor toward the upper wall or lid.
- If the cork needs support, fasten it through the lid with a wire nail or another secure method only while the enclosure is empty. The keeper example uses a wire nail to hold the plant and cork.
- Check that the cork does not touch the lid in a way that prevents a full seal, and that it cannot rotate or fall when the container is gently moved.
- Add optional foliage beside or behind the cork, leaving holes and the lid seam unobstructed.
4. Add a restrained substrate layer
Use only enough substrate to cover the floor and keep the container easy to clean. A shallow layer also makes it easier to see whether moisture is accumulating. In the drilled-box example, the substrate and the bottle cap are positioned so neither touches the cork; that separation helps keep the primary climbing surface from staying continuously wet.
5. Add the selected water or moisture source
Place a small cap or dish where it can be reached but cannot tip into the substrate or block the sling’s route. Fill it only after the enclosure is assembled and tested. If you are following a misting or damp-material approach instead, leave a clear area that can be moistened without spraying the spider directly.
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6. Test before transferring the sling
- Close the lid and gently invert or tilt the empty enclosure over a clean work surface to check for loose furnishings and an insecure lid.
- Look through every ventilation hole against a contrasting background. If the sling could pass through, the opening is unsuitable.
- Confirm that the cork, foliage, and cap leave a vertical path and do not create a bridge to a lid gap.
- Run the planned moisture routine once and observe whether water pools, runs onto the cork, or blocks airflow.
Moisture: two supported approaches, not one universal recipe
Humidity should not be treated as a goal that justifies a wet enclosure. The sources agree on avoiding soggy, stagnant housing, but they describe different ways to provide water to very small arboreal slings.
| Approach | How it is described | Best fit and observation points |
|---|---|---|
| Dry substrate with a full cap | Ratmosphere says the substrate is usually kept dry while a deep bottle cap is kept full. A photograph showing wet substrate resulted from a spill, according to the author. | Useful when you can keep a stable cap in the enclosure and monitor it without spills; keep the cap and substrate from soaking the cork. |
| Slightly damp substrate with spot misting | Northwest Zoological Supply describes slightly damp coir or coir/vermiculite and misting a spot away from the spider once or twice weekly in very small containers. | Requires watching how quickly the spot dries. Misting should not leave the walls, substrate, and furnishings continuously saturated. |
| Damp sphagnum in a ventilated cup | The same guide gives damp sphagnum as part of a young-arboreal setup and emphasizes monitoring moisture and preventing stagnant air. | Use only enough material to provide controlled moisture; remove or adjust it if condensation and stale air persist. |
Fear Not Tarantulas’ Caribena versicolor care sheet also calls for good cross-ventilation, warns against overly wet sling housing, and describes damp rather than soaking substrate. These sources do not establish a single humidity percentage or a controlled winner between a dish and droplets. Choose one method, observe the enclosure, and change the amount or frequency when the interior stays saturated or dries too rapidly.
Signs that moisture is too high
- Condensation remains on several surfaces instead of clearing between watering events.
- Substrate stays visibly wet and begins to smell stale.
- Air holes are blocked by damp material or foliage.
- The spider is repeatedly forced onto a wet surface because the cork or retreat area is saturated.
Correct these conditions by increasing unobstructed airflow, reducing the amount of water or damp material, and allowing the enclosure to dry partially. Do not compensate for poor ventilation by adding more water.
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If the chosen moisture source disappears quickly and the sling has no accessible water or slightly humid retreat area, make a small adjustment rather than flooding the enclosure. Refill a stable cap, moisten a limited spot away from the spider, or add a modest amount of damp sphagnum, then recheck the drying rate. The correct response depends on the container’s airflow, room conditions, substrate depth, and the individual sling.
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Ventilation and escape-proofing checks
Cross-ventilation is the recurring requirement across the keeper instructions and care sheets. Openings should be distributed so air can exchange through the enclosure, while the lid and holes remain too small for escape. There is no evidence that one exact hole count works for every box.
- Keep holes above the substrate line and away from places where a cap can sit against them.
- Do not cover side holes with cork, leaves, tape, or damp sphagnum.
- Check the lid after every reassembly; a slight misalignment can create a larger escape route than the drilled holes.
- Inspect the container in low light with a flashlight behind it. Gaps and cracked plastic are easier to see against the beam.
- Recheck after the sling webs. Silk can cover openings or make a route to the lid that did not exist on setup day.
Arrange cork, foliage, and the retreat route
Place the cork so the sling can climb without crossing an exposed, unsupported gap. A piece that reaches upward gives silk a firm anchor and lets the spider choose its preferred height. Plastic or silk foliage can widen the webbing area and create cover, but it should supplement rather than replace a stable vertical anchor.
Keep the floor open enough to remove spilled water or old substrate. Avoid packing the container with ornaments: each additional item can obstruct ventilation, trap moisture, or shift during maintenance. The sources support cork and foliage as webbing structures; the requirement that they remain stable and clear of vents is practical construction guidance for safe use.
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| Decision | Drilled clear box | Ventilated insect-lid cup |
|---|---|---|
| Ventilation work | You choose hole position and must deburr and test every opening. | Perforations are supplied, but spacing and escape security still need inspection. |
| Size control | Available box dimensions include the 100C and 105C examples. | The 24-ounce cup is one example for a small second-instar Avicularia, not a mandatory volume. |
| Furnishing access | Rigid walls make it easy to support cork through the lid if the fastening is secure. | Lightweight cups are quick to set up, but the lid and plastic must still support the climbing structure. |
| Water routine | Works with a cap-based method or a limited damp spot. | Often paired in the guide with coir, damp sphagnum, and monitored misting. |
| Main failure mode | Oversized holes, sharp drilled edges, or a lid that no longer seals. | Assuming a ventilated lid prevents stagnant conditions or guarantees escape security. |
Routine checks after the sling is introduced
- At each observation, verify that the lid is fully seated and that the sling has not webbed over a gap.
- Check the water source, refill a cap if that is your chosen method, or inspect the limited damp spot or sphagnum if using the alternative method.
- Look at the cork and retreat, not just the floor. The climbing surface should remain usable and not be soaked by a spill.
- Inspect airflow, clearing any substrate, silk, or foliage that covers several ventilation holes.
- Record growth and space, including whether the spider can still climb and turn comfortably. Use those observations to plan the next enclosure rather than relying on a fixed calendar.
Move slowly during maintenance. A sling can be difficult to see against cork or foliage, so locate it before opening the lid or moving any furnishing.
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Troubleshooting common setup problems
The enclosure is constantly wet
Reduce the water input, remove excess damp material, and clear the ventilation openings. A full cap does not require wet substrate, and a misting routine should leave a drying interval. If the cork remains soaked, move the moisture source away from it and replace any spilled substrate.
There is condensation and little air movement
Check whether holes are present on more than one face and whether foliage or substrate blocks them. Increase effective cross-ventilation by clearing obstructions or changing the container at the next safe opportunity; do not simply add more holes without confirming that the new openings remain escape-proof.
The sling stays near the lid
First check for an escape route, then inspect the vertical anchor. A sling may choose a high retreat, but a lid gap, unstable cork, or blocked lower route needs correction. Add or reposition a secure climbing surface only after confirming that the lid can still close completely.
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Stabilize it on a level section of the floor or switch to the limited misting or damp-material approach described for very small containers. A spill that wets the substrate or cork changes the enclosure conditions, so remove the excess moisture rather than treating the spill as the normal routine.
The sling has outgrown the setup
Prepare a taller, wider container such as the 105C example when the current interior no longer allows a clear climb, retreat, and maintenance path. Transfer the cork or foliage only if it fits securely; never force a furnishing into the new lid or leave a gap around it.
A practical decision sequence
- Identify the spider’s current size and climbing behavior. Select a compact vertical container, not a generic terrestrial tub.
- Choose the ventilation format. Use a drilled box if you can make and inspect precise openings, or a ventilated insect-lid cup if its holes and lid are secure for the individual sling.
- Install one stable vertical anchor. Add optional foliage without blocking airflow.
- Select one moisture routine. Use a stable cap with mostly dry substrate, or a limited damp spot/sphagnum approach with monitored drying; do not combine methods indiscriminately.
- Test the empty enclosure. Confirm the lid, holes, furnishings, and moisture behavior before moving the sling.
- Observe and adjust. Base changes on condensation, drying rate, access to water, stability, and available climbing space rather than on an assumed universal humidity number.
Sources and scope
The drilled-box dimensions and construction sequence are from Ratmosphere’s “Avicularia/Caribena: How to create an enclosure for slings,” published July 24, 2025. Northwest Zoological Supply’s undated “Arboreal Tarantula Care & Housing” and “Pink-toes and Tree Spiders” guides provide the ventilated-cup, cork, foliage, coir, sphagnum, and moisture-management examples. Fear Not Tarantulas’ undated Caribena versicolor care sheet supplies corroborating guidance on cross-ventilation and avoiding overly wet housing. The Royal Veterinary College’s December 2024 tarantula-care sheet is broad species context rather than a sling-specific construction plan.
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