Sling Care

Sling care is the phase of tarantula breeding that separates people who thought breeding sounded fun from people who actually follow through on the commitment. When that egg sac opens and you are suddenly looking at dozens, hundreds, or even a thousand tiny spiderlings, the reality of what you signed up for hits fast. Every one of those slings needs an individual enclosure, regular feeding, appropriate moisture, and eventually a buyer or a permanent home. The breeding event itself might have taken a few hours. Sling care takes months.

This topic is primarily relevant to tarantula breeders, though the principles of raising tiny, fragile offspring apply broadly to anyone breeding arachnids including scorpions. Tarantula slings are the most commonly discussed because tarantulas are the most frequently bred arachnid in the hobby and because their egg sacs produce offspring numbers that demand serious planning. Whether you are raising fifty slings from a smaller species or five hundred from a prolific one, the daily work of maintaining all those tiny enclosures is the real test of your breeding commitment.

Getting sling care right matters because these animals are at their most vulnerable during the early instars when they are small, fragile, and dependent on conditions you provide. Slings that receive proper humidity, appropriate prey items, and clean enclosures grow steadily and develop into healthy juveniles. Slings that are neglected, kept too dry, fed inconsistently, or housed in unsuitable containers experience high mortality, stunted growth, and stress-related problems that undermine the entire purpose of your breeding project. Your reputation as a breeder depends directly on the quality of the animals you produce.

New breeders typically ask how often to feed slings, what size prey to offer, how to maintain humidity in tiny enclosures, when slings are ready to sell, and what to do about the ones that refuse to eat. These are all practical questions with straightforward answers, but the cumulative effort of applying those answers across a large number of individual animals is what catches people off guard. One sling is simple. Two hundred slings is a logistical operation.

This article covers the practical realities of raising tarantula slings from the point of separation through the early juvenile stage, including housing, feeding, humidity management, growth monitoring, and the timeline for transitioning slings to their new homes.

The core concept of sling care is maintaining individual enclosures at appropriate conditions while providing regular nutrition and monitoring growth across your entire clutch. Slings cannot be communally housed beyond the very earliest stage because tarantulas are cannibalistic, and even well-fed slings will eat each other if given the opportunity. This means every sling gets its own container, its own moisture management, and its own feeding schedule. The scale of this operation is the defining challenge of tarantula breeding.

Biologically, newly separated slings are in their second instar and have recently absorbed their yolk sac, which means they are ready for their first meal but still extremely small and delicate. Most tarantula slings at separation measure between a quarter inch and half an inch in leg span depending on species. They grow through successive molts, shedding their exoskeleton each time to accommodate a larger body. The interval between molts depends on temperature, feeding frequency, and species, but for well-fed slings kept at appropriate temperatures, you can expect a molt roughly every three to six weeks during the early growth phase.

Housing slings appropriately means providing enclosures that are small enough to make finding prey easy but large enough that the sling can move away from moisture if it chooses. Deli cups and small condiment containers in the two to four ounce range work well for most species at the earliest stages. Each container needs ventilation, a small amount of substrate, and a moisture gradient where one area is dampened and the rest stays drier. The sling decides where along that gradient it wants to be. Terrestrial species generally prefer slightly more moisture than arboreal species, but all slings need some access to humidity during the vulnerable pre-molt period.

Feeding slings requires appropriately sized prey, which for the smallest slings means pre-killed or crushed fruit flies, pinhead crickets, or other micro feeders. Live prey that is too large can injure or stress tiny slings, so sizing matters. As slings grow through successive molts, you can gradually increase prey size. Most breeders feed slings once or twice per week, removing uneaten prey after twenty-four hours to prevent mold and mite issues. Some slings refuse food for days or weeks before a molt, which is normal and not cause for alarm as long as the abdomen is not shrunken.

Success in sling care shows as consistent growth across most of your clutch, regular molting, healthy appetites between molts, and low mortality beyond the expected losses in the first few weeks. Some mortality in large clutches is normal, particularly among the smallest or weakest individuals, but survival rates above eighty percent indicate good husbandry. Slings that are growing at very different rates within the same clutch are telling you that conditions in some enclosures are suboptimal, usually related to moisture or temperature differences.

The ethical responsibility during sling care is straightforward but demanding. You produced these animals, and they depend entirely on you until they are in someone else's competent hands. Cutting corners on feeding, letting enclosures dry out, or neglecting maintenance because you are tired of the daily work causes suffering in animals that exist because of your decision to breed. If maintaining a large number of slings feels unsustainable, the answer is to sell or rehome faster, not to reduce the quality of care.

Terrestrial new world tarantula slings, which include popular genera like Brachypelma, Tliltocatl, and Grammostola, tend to be hardy and forgiving during the rearing phase. These slings tolerate a range of humidity levels and temperatures, grow at a moderate pace, and accept common feeder insects without much fuss. They are among the easiest slings to raise in quantity, which is one reason these genera are popular among first-time breeders. The main challenge is that many terrestrial new world species grow slowly, meaning you may be maintaining slings for months before they reach a sellable size.

Old world tarantula slings from genera like Poecilotheria, Heteroscodra, and various baboon spider groups present additional challenges because they are faster, more defensive, and less tolerant of handling errors. Old world slings can bolt from open containers at surprising speed, making rehousing and maintenance more nerve-wracking than with docile new world species. Some old world species also have narrower humidity preferences and are less forgiving of enclosures that dry out completely. Breeders working with old world slings need to be more precise and more careful during daily maintenance.

Arboreal species of both new world and old world origin have specific housing needs that differ from terrestrial slings. Arboreal slings benefit from taller enclosures with anchor points for webbing, and they often prefer to position themselves away from the substrate on container walls or simple cork bark pieces. Ventilation placement matters more with arboreal species because stagnant, overly humid conditions can promote fungal problems. These slings still need access to moisture, but the delivery method often works better as light misting on container walls rather than dampened substrate.

Scorpion offspring, while not called slings, face similar rearing challenges and deserve mention in this context. Scorpion young ride on the mother's back for the first instar and then disperse, at which point they need individual housing to prevent cannibalism. Scorpion juveniles are generally hardier than tarantula slings of comparable size and accept prey items readily, but they are also more prone to escape due to their ability to squeeze through tiny gaps. Secure lids with no gaps larger than the smallest juvenile are essential.

Across all arachnid groups, the universal principle of sling care is that small animals need appropriately scaled environments, prey items, and moisture access. What works for a two-inch juvenile does not work for a quarter-inch sling. Matching your care approach to the actual size and needs of the animals at each growth stage, rather than applying a one-size-fits-all approach, is what produces healthy juveniles ready for their new homes.

Preparation for sling care should begin well before the egg sac is expected to open. Assemble your containers, prepare your substrate, set up your ventilation, and establish your feeder culture so that everything is ready when the slings are separated. If you are expecting a large clutch, this means having a hundred or more prepared enclosures stacked and organized in a system that allows efficient feeding and moisture management. Shelving units with labeled rows work well, and many breeders develop a rotation system where they work through one shelf per day to keep the workload manageable.

Separation day is the most labor-intensive part of sling care. When the egg sac is opened or the slings disperse naturally, you need to transfer each one into its own prepared container using a soft paintbrush, small spoon, or gentle coaxing. This process takes hours for large clutches and requires patience and a steady hand to avoid injuring the tiny spiderlings. Work in a contained area where escapees can be recovered easily, and count as you go so you know your total and can track mortality going forward.

Daily and weekly maintenance follows a routine that becomes second nature after the first few weeks. Check moisture levels across all enclosures, adding a few drops of water to the damp corner of containers that are drying out. Feed on your established schedule, dropping in appropriately sized prey and noting which slings take food and which refuse. Remove uneaten prey and boluses after twenty-four hours. This sounds simple for one sling, and it is. For two hundred slings, it takes discipline and organization to maintain consistently.

When slings refuse food, the first question is whether a molt is approaching. Pre-molt slings darken in color, become less active, and refuse prey for days to weeks before molting. This is completely normal. After molting, give the sling at least three to five days for its new exoskeleton to harden before offering food again. If a sling refuses food without signs of pre-molt and its abdomen appears shrunken, check your humidity and temperature. Dehydration and cold are the most common causes of appetite loss outside the normal molt cycle.

Begin selling or rehoming slings once they have completed at least two or three molts after separation, are feeding reliably, and are large enough to ship safely. Most buyers prefer slings that are at least three-quarter inch in leg span because smaller slings are fragile and difficult for less experienced keepers to maintain. Price according to species, size, and market conditions, and package carefully for shipping or local pickup. Your goal is to move slings at a steady pace that keeps your operation manageable without flooding the market and crashing prices.

The most common mistake in sling care is letting enclosures dry out because the breeder underestimated how quickly small containers lose moisture. A two-ounce deli cup with ventilation holes can go from appropriately damp to bone dry in two or three days depending on ambient humidity and temperature. Slings that are kept too dry fail to molt properly, become dehydrated, and die from conditions that are entirely preventable with regular moisture checks. Establishing a consistent routine for checking and refreshing moisture across all your enclosures is the single most important habit in sling care.

Feeding prey that is too large is another frequent problem, especially among breeders who want their slings to grow faster. A pinhead cricket is an appropriate meal for a small sling. A cricket that is half the size of the sling is a threat, not a meal. Oversized prey can injure slings during struggles, stress them into refusing food, or simply be ignored while fouling the enclosure as it dies. Feed small and feed consistently rather than trying to accelerate growth with oversized meals that create more problems than they solve.

Neglecting enclosure maintenance because the workload feels overwhelming is a mistake that compounds over time. Mold develops on uneaten prey and boluses. Mites colonize dirty substrate. Stale air in poorly ventilated containers creates respiratory stress. Each individual problem is minor, but across a hundred neglected enclosures, the cumulative effect is elevated mortality and poor animal quality. If maintaining your entire clutch feels unsustainable, the answer is to sell or give away a portion rather than providing substandard care to all of them.

Failing to plan sales before the slings arrive leaves breeders stuck with more animals than they can maintain long-term. The time to line up buyers, establish your presence in sales communities, and price your slings is before the egg sac opens, not three months later when you are drowning in feeding obligations. Breeders who start marketing early can begin moving slings as soon as they reach sellable size, preventing the bottleneck that leads to overcrowding and caretaker fatigue.

Underestimating the time commitment is perhaps the root cause behind most other sling care mistakes. New breeders imagine the feeding and maintenance as a quick daily task, but when you multiply even a five-minute-per-enclosure routine by a hundred or more containers, you are looking at hours of work per week. Going into sling care with realistic expectations about the time investment helps you plan your schedule, set sustainable routines, and maintain the quality of care that produces healthy animals and protects your reputation as a breeder.

Sling care is where the real work of tarantula breeding happens, and it is the phase that determines both the quality of your animals and your reputation in the hobby. Anyone can pair tarantulas and hope for an egg sac. Raising the resulting slings to healthy juveniles with consistent, attentive care is what separates serious breeders from people who got in over their heads. Approach sling care as a months-long commitment that requires daily attention, and you will produce animals you can be proud of.

The practical foundation of sling care is simple even though the scale can be demanding. Small enclosures with appropriate moisture, ventilation, and regular feeding produce healthy, growing slings. The challenge is maintaining that standard across every single container in your collection, every day, without letting quality slip when the novelty wears off and the routine feels tedious. Systems and schedules are your friends here. Build routines that work, and stick with them.

Every species has its own growth rate, humidity preferences, temperament, and feeding behavior, and your care approach needs to account for those differences. A setup that works perfectly for hardy terrestrial new world slings may need adjustment for sensitive arboreal species or fast-moving old world juveniles. Learn what your specific species needs through research and observation rather than assuming a generic approach covers everything.

The breeders who do this well are the ones who prepared before the egg sac opened, built systems that made daily care manageable, started marketing early enough to move slings at a sustainable pace, and never let the workload compromise the quality of care each individual animal received. That is the standard to aim for, and the animals you produce will reflect the effort you put into raising them.

If you are thinking about breeding tarantulas and the sling care phase sounds daunting, that is actually a healthy response. It means you are taking the commitment seriously enough to evaluate whether you can follow through. Better to recognize the scale of the work now and prepare accordingly than to discover it after five hundred slings are depending on you for their next meal.