Feeder Insects

Feeder insects are the backbone of nutrition for insectivorous and omnivorous reptiles, and the choices you make about which insects to offer, how you prepare them, and how often you rotate through different species directly shape your animal's health over its lifetime. A cricket is not just a cricket when it comes to reptile nutrition. What that cricket ate before it became a meal, whether it was dusted with calcium, and how it fits into the larger feeding rotation all determine whether your reptile is getting what it needs or slowly developing deficiencies that show up months or years down the line.

The reptile world divides roughly into dietary categories, and insects play a major role in at least two of them. Pure insectivores like leopard geckos and chameleons depend entirely on feeder insects for their protein, fat, vitamins, and minerals. Omnivores like bearded dragons rely on insects for the protein portion of their diet, with the balance shifting from heavily insect-based in juveniles to mostly vegetable-based in adults. Even some species you might not think of as insect eaters will opportunistically take bugs when offered, making feeder insects the most widely relevant prey category in reptile keeping.

The central truth about feeder insects is that they are only as nutritious as what they last ate. An empty cricket that has been sitting in a pet store container for days with nothing but a piece of cardboard to chew on is nutritionally hollow compared to a cricket that spent the last twenty-four hours eating high-calcium gut-load mix packed with greens and vitamins. Gut-loading transforms mediocre feeders into genuinely nutritious meals, and skipping this step is one of the most common reasons reptiles develop calcium deficiency even when their owners think they are feeding correctly.

Calcium dusting on top of gut-loading is the second non-negotiable piece of the insect-feeding puzzle. Even well-gut-loaded insects do not contain enough calcium on their own to meet a reptile's daily requirements, so dusting with a calcium supplement before every feeding bridges that gap. The combination of gut-loading plus dusting plus UVB lighting for D3 synthesis creates the three-legged stool that keeps your reptile's bones strong and its metabolism functioning properly.

This article covers the most common feeder insects available to reptile keepers, their nutritional profiles, how they compare to each other, and practical guidance for building a rotation that keeps your animal healthy and interested in its food.

Crickets remain the most widely used feeder insect in reptile keeping, and for good reason. They are readily available, affordable, easy to gut-load, and accepted by virtually every insect-eating reptile species. Brown house crickets and banded crickets are the two varieties you will encounter most often. Both are nutritionally similar, though banded crickets tend to be quieter and less prone to escaping, which makes them easier to manage at home. Size your crickets so they are no wider than the space between your reptile's eyes, and always gut-load them for at least twelve to twenty-four hours before feeding.

Dubia roaches have become the preferred feeder for many experienced keepers because of their nutritional profile and ease of colony maintenance. They are higher in protein and lower in fat than crickets, they do not smell, they cannot climb smooth surfaces, and they do not chirp at three in the morning. A dubia colony in a plastic tub with egg crates for hiding, a heat source, and regular feeding with fruits and vegetables produces a self-sustaining food supply that costs almost nothing to maintain once established. The main limitation is that dubias are illegal to keep in some states, so check your local regulations before starting a colony.

Black soldier fly larvae, commonly sold under the brand name Calciworms or Phoenix Worms, are one of the few feeder insects that naturally contain high calcium levels without requiring additional dusting. Their calcium-to-phosphorus ratio is excellent, making them a valuable addition to any rotation. They are small, soft-bodied, and easy for reptiles of all sizes to digest. The downside is they are relatively expensive compared to crickets or dubias, and they cannot be gut-loaded effectively since they do not eat during their larval stage in commercial form.

Mealworms and superworms are popular feeders that require some caution. Both are relatively high in fat and have a tough chitinous exoskeleton that can be difficult for smaller reptiles to digest. Mealworms work as an occasional treat but should not be a dietary staple due to their poor calcium-to-phosphorus ratio and higher fat content. Superworms are larger and have even more chitin, making them better suited to larger reptiles like adult bearded dragons or blue-tongued skinks that can handle the tougher exoskeleton without digestive issues.

Hornworms and silkworms offer excellent hydration and nutrition with soft bodies that are easy to digest. Hornworms are mostly water, which makes them a great choice for reptiles that need additional hydration or those recovering from illness. Silkworms are high in protein and calcium relative to other feeders, with a soft body that even small reptiles handle easily. Both are more expensive and harder to source than crickets or dubias, so they typically serve as rotation supplements rather than staple feeders.

Waxworms are the candy bar of the feeder insect world. They are extremely high in fat, and most reptiles find them irresistible, which is exactly the problem. Offering waxworms too frequently leads to addiction-like behavior where reptiles refuse other feeders in hopes of getting more waxworms. Use them sparingly as treats, for appetite stimulation in animals that have stopped eating, or as a reward during training sessions. They have no place as a regular dietary component for any reptile species.

Leopard geckos are strict insectivores that depend entirely on feeder insects for nutrition. A rotation of gut-loaded crickets, dubia roaches, and occasional black soldier fly larvae or hornworms covers their needs well. Leopard geckos tend to be visual hunters that respond to movement, so live feeders generally work better than anything pre-killed. Dust every feeding with calcium powder, alternating between calcium without D3 and calcium with D3 based on whether your gecko has adequate UVB exposure.

Bearded dragons shift their insect-to-vegetable ratio as they grow. Juveniles under a year eat roughly seventy percent insects and thirty percent greens, while adults flip that ratio to roughly seventy percent greens and thirty percent insects. For the insect portion, dubias and crickets make the best staples, with black soldier fly larvae, hornworms, and the occasional superworm for variety. Avoid feeding mealworms to juvenile beardies, as the chitin content can cause impaction in smaller animals.

Chameleons are insectivores with a strong preference for variety, and many experienced chameleon keepers find that rotating through four or five different feeder species produces the best feeding response and overall health. Crickets, dubias, silkworms, hornworms, and black soldier fly larvae all work well for chameleons. These animals are also among the most sensitive to calcium deficiency, so gut-loading and dusting protocols matter enormously. Chameleons should have every feeder dusted, with a multivitamin supplement added to the rotation twice per month.

Blue-tongued skinks are omnivores that handle a wider range of feeder insects including superworms and larger dubias. Their strong jaws process chitin more effectively than smaller lizard species, which opens up the feeder options somewhat. That said, insects should still represent only about forty to fifty percent of an adult skink's diet, with the remainder split between lean protein sources and vegetables.

Crested geckos are an exception to the typical insect-feeding discussion. While they will eat insects, most crested gecko keepers rely on commercial crested gecko diet as the primary food source, with insects offered as supplemental enrichment once or twice a week. Small crickets and black soldier fly larvae work well as the insect component for cresties that accept live prey.

Skipping gut-loading is the single most damaging mistake in feeder insect management, and it happens constantly because the results are invisible in the short term. A cricket that ate cardboard and another cricket that ate calcium-rich greens look identical to the person dropping them into the enclosure. But their nutritional content is dramatically different, and the reptile eating them either builds strong bones or develops metabolic bone disease one empty meal at a time. Gut-load every insect for twelve to twenty-four hours before feeding. No exceptions.

Feeding insects that are too large causes impaction, choking, and in some cases permanent digestive damage. The rule about prey width not exceeding the space between the reptile's eyes exists for a reason, and ignoring it because a larger cricket was the only size available at the store is not a risk worth taking. Buy appropriate sizes, or if your local options are limited, order feeders online from reptile supply companies that offer specific size ranges.

Relying on a single feeder species creates nutritional gaps regardless of how good that one feeder is. Crickets alone do not provide the same nutrient profile as crickets plus dubias plus black soldier fly larvae plus occasional hornworms. Each insect brings different ratios of protein, fat, calcium, and micronutrients, and variety ensures your reptile gets broader coverage. Aim for at least three different feeder species in your regular rotation.

Waxworm addiction is a real behavioral problem that results from offering waxworms too frequently. Once a reptile learns that waxworms are available, some individuals will refuse all other feeders and essentially go on hunger strike until waxworms reappear. Breaking this cycle requires patience and willingness to let your reptile get hungry enough to accept other options. Prevent the problem entirely by limiting waxworms to rare treats rather than regular offerings.

Using wild-caught insects introduces pesticide exposure, parasites, and unknown contaminants into your reptile's diet. That grasshopper in your backyard may look like free food, but if your neighbor sprayed their lawn last week, it could be carrying enough chemical residue to sicken or kill your reptile. Always source feeder insects from captive-bred suppliers where you know the growing conditions and can trust the product is clean.

Establish a gut-loading routine that runs on autopilot. Keep a container of high-calcium gut-load mix on hand and feed it to your insects the day before they become meals. Good gut-load ingredients include collard greens, mustard greens, sweet potato, carrots, and commercial gut-load products formulated for reptile feeders. The process takes two minutes and transforms every insect from a nutritional question mark into a reliable delivery vehicle for the vitamins and minerals your reptile needs.

Dust insects with calcium at every feeding for juveniles and breeding females, and at every other feeding for healthy adults. The dusting method is simple: place a few insects in a bag or container with a small amount of calcium powder, shake gently to coat, and offer immediately. Alternate between calcium without D3 and calcium with D3 based on your UVB setup. Add a multivitamin dust once or twice per month to cover trace minerals and fat-soluble vitamins that calcium alone does not provide.

Maintain a rotation of at least three feeder species and introduce new feeders gradually when expanding your options. If your reptile currently eats only crickets, add dubias one feeding at a time until they become part of the accepted rotation. Then introduce black soldier fly larvae or hornworms as a third option. Building variety slowly prevents food refusal and gives your reptile time to accept each new item before the next one appears.

Store feeder insects properly to keep them healthy and nutritious until feeding time. Crickets do best in a ventilated container with egg crate hiding spots, fresh water gel, and gut-load food. Dubias need warmth, darkness, and regular feeding. Mealworms and superworms can be refrigerated to slow their growth if you need to extend their shelf life. Dead feeders should be removed daily from any colony or holding container, as decomposing insects contaminate the living feeders and reduce the quality of what eventually reaches your reptile.

Feeder insects are not interchangeable commodities. Each species has a distinct nutritional profile, and the combination you choose, how you prepare them, and how you rotate through them determines whether your reptile thrives or slowly deteriorates. Crickets and dubias make excellent staples. Black soldier fly larvae bring natural calcium. Hornworms and silkworms add hydration and variety. Waxworms are treats only. Mealworms and superworms serve specific roles for specific species. Build your rotation around these basics and your insect-feeding program will be solid.

Gut-loading and calcium dusting are not optional steps that experienced keepers skip because they know better. They are fundamental requirements that experienced keepers follow religiously because they have seen what happens when those steps get neglected. Every insect your reptile eats should have been gut-loaded within the previous twenty-four hours and dusted with calcium before it enters the enclosure. This is the minimum standard, and falling below it means falling below what your reptile needs to stay healthy.

Your individual reptile will have preferences within the range of appropriate feeders, and paying attention to those preferences helps you build a rotation your animal actually eats consistently. Some bearded dragons go crazy for dubias but ignore crickets. Some leopard geckos prefer black soldier fly larvae over everything else. Observe what your reptile responds to enthusiastically, build the core rotation around those preferences, and introduce variety around the edges to keep nutrition broad and feeding behavior engaged.

The investment in good feeder insect practices pays for itself many times over in veterinary bills you never have to pay. Metabolic bone disease, impaction, parasitic infections, and nutritional deficiency are all expensive to treat and stressful for both you and your reptile. Gut-loading, dusting, proper sizing, clean sourcing, and variety cost almost nothing in terms of time and money but prevent the most common health problems insectivorous reptiles face in captivity. Do it right from the start and your reptile's health reflects the effort.