House Gecko

The common house gecko, Hemidactylus frenatus, is an obligate insectivore whose dietary needs in captivity must closely replicate the diversity of invertebrate prey it consumes in the wild. In their natural tropical and subtropical habitats, house geckos opportunistically feed on moths, mosquitoes, small beetles, ants, and a wide range of other arthropods attracted to artificial lighting on buildings. This varied diet provides a broad spectrum of amino acids, fatty acids, and micronutrients that no single feeder species can replicate in isolation. Captive keepers must therefore prioritize variety in both prey species and supplementation to prevent the nutritional deficiencies that commonly afflict geckos kept on monotonous diets.

Caloric requirements for house geckos scale with body mass, ambient temperature, and reproductive status. An adult house gecko weighing between four and seven grams typically requires three to six appropriately sized insects every two to three days, though juveniles under three months of age benefit from daily feeding to support rapid skeletal growth. Breeding females have elevated calcium demands during vitellogenesis and eggshell formation, and failure to meet these needs can result in follicular stasis or metabolic bone disease. Temperature plays a critical role because ectothermic metabolism is directly tied to environmental warmth, meaning geckos housed at the lower end of their preferred range will eat less and metabolize nutrients more slowly.

The size of prey items is a crucial consideration that directly affects both safety and nutritional uptake. The general guideline for insectivorous reptiles is to offer prey items no wider than the distance between the gecko's eyes, which for an adult house gecko translates to insects roughly one-quarter to three-eighths of an inch in body width. Prey that is too large poses a choking hazard and can cause intestinal impaction, while excessively small prey may not stimulate a strong feeding response and forces the gecko to expend more energy per calorie consumed. Neonates and juveniles require pinhead or one-eighth-inch crickets and similarly tiny feeders during their first weeks of life.

Hydration intersects with nutrition in important ways for house geckos. While these geckos obtain a significant portion of their moisture from prey items, they also drink water droplets from enclosure walls and foliage, a behavior rooted in their arboreal lifestyle. Dehydration compromises digestion and nutrient absorption, so food product selection should be considered alongside the keeper's humidity and misting regimen. Some commercial gecko diets incorporate moisture content that supplements hydration, though these products should never replace a proper water delivery system.

Understanding the calcium-to-phosphorus ratio in feeder insects is foundational to preventing metabolic bone disease, the most common nutritional disorder in captive geckos. Most commercially available feeder insects have an inverted calcium-to-phosphorus ratio, meaning they contain significantly more phosphorus than calcium. Without supplementation, this imbalance causes the gecko's body to leach calcium from its skeletal system to maintain blood calcium homeostasis, leading to soft bones, jaw deformities, tremors, and eventually death. The target dietary ratio for house geckos is approximately two parts calcium to one part phosphorus, which is achievable only through a combination of gut-loading feeders and dusting them with calcium powder prior to offering.

Crickets remain the most widely available and commonly used feeder insect for house geckos, and for good reason. Domestic brown crickets (Acheta domesticus) and banded crickets (Gryllodes sigillatus) are nutritionally adequate as a dietary staple when properly gut-loaded and supplemented. Banded crickets have gained popularity in recent years because they are less prone to the cricket paralysis virus that periodically devastates Acheta domesticus colonies, they produce less odor, and they are less likely to bite resting geckos if left uneaten in the enclosure. When purchasing crickets, keepers should select from reputable breeders who maintain clean colonies and offer size-graded insects, as consistent sizing simplifies portion control.

Dubia roaches (Blaptica dubia) represent an excellent alternative or rotational feeder for house geckos, though their larger adult size means only nymphs are appropriate for this small species. Dubia nymphs in the one-quarter-inch range are ideal for adult house geckos and offer a superior nutritional profile compared to crickets, with higher protein content and lower chitin percentage. They do not jump, climb smooth surfaces, or produce noise, making them easier to manage than crickets. Their slower movement speed can be a disadvantage with particularly skittish geckos who respond better to faster-moving prey, but most house geckos readily accept them after an initial adjustment period.

Black soldier fly larvae (Hermetia illucens), marketed under various brand names, have become a valuable addition to the house gecko feeding rotation. These larvae are notable for their naturally high calcium content, with a calcium-to-phosphorus ratio that is already close to or exceeds the ideal two-to-one target without additional supplementation. This makes them particularly useful for breeding females or geckos recovering from calcium deficiency. They should be offered in moderation rather than as a sole diet, however, because their high fat content can contribute to hepatic lipidosis if overfed. Small larvae are appropriate for house geckos, and they can be offered in a shallow escape-proof dish.

Mealworms and superworms are sometimes offered to house geckos but require careful consideration. Standard mealworms (Tenebrio molitor) have a tough chitinous exoskeleton relative to their body size, which can be difficult for smaller geckos to digest efficiently. Mini mealworms or freshly molted mealworms with soft, pale exoskeletons are preferable if mealworms are used at all. Superworms (Zophobas morio) are generally too large for house geckos and should be avoided entirely. Waxworms (Galleria mellonella) are extremely high in fat and should be reserved as an occasional treat or used to entice underweight geckos to resume feeding, never as a dietary staple.

Sourcing feeders from reputable suppliers is a food safety issue as much as a quality concern. Wild-caught insects should never be offered to captive geckos because they may carry pesticide residues, parasites, or harmful bacteria. Online feeder insect suppliers who ship overnight in insulated containers generally provide healthier, cleaner stock than bulk bins at large pet retail chains, where insects may have been held in crowded, unsanitary conditions for extended periods. Keepers who maintain their own feeder colonies gain the greatest control over insect health and nutrition, and breeding Dubia roaches or black soldier flies at home is straightforward with minimal equipment.

The commercial reptile food market has expanded considerably in recent years, and several products now exist that are formulated specifically for insectivorous geckos. Powdered meal replacement diets designed for crested geckos and day geckos have been tested by some house gecko keepers as supplementary feeds, though it is important to understand that house geckos are strict insectivores and do not naturally consume fruit or nectar. Products containing fruit purees and plant-based proteins do not align well with the digestive physiology of Hemidactylus species, and while a house gecko may lick at such a mixture out of curiosity, it should not be relied upon as a significant caloric source.

Freeze-dried insect products offer convenience but come with nutritional trade-offs that keepers should understand. Freeze-dried crickets, mealworms, and black soldier fly larvae retain much of their original protein and fat content, but the freeze-drying process removes virtually all moisture and can degrade certain heat-sensitive vitamins. More critically, many house geckos are stimulated to feed primarily by prey movement, and a motionless freeze-dried insect may not trigger a feeding response. Some keepers have success rehydrating freeze-dried insects and offering them with feeding tongs to simulate movement, but this approach adds preparation time that partially negates the convenience factor.

Canned insect products represent another shelf-stable alternative that some keepers incorporate into their feeding rotation. These soft, pre-cooked insects are typically packed in a light brine or their own juices and can be offered via tongs or placed in a feeding dish. Their soft texture makes them easier to digest than freeze-dried alternatives, and the moisture content is significantly higher. However, the canning process does alter the nutritional profile, and these products should be dusted with calcium and vitamin supplements just as live feeders would be. They work best as an emergency backup food source when live feeder availability is disrupted.

Insect-based gel foods and pastes have emerged as a newer product category aimed at insectivorous reptiles. These products blend processed insect protein with vitamins, minerals, and binding agents into a paste that can be offered in a dish or smeared onto enclosure surfaces. The concept is sound in theory, but acceptance by house geckos is highly variable and generally lower than for live prey. Geckos that have been raised from hatchlings with occasional gel food exposure tend to accept it more readily than wild-caught adults transitioning to captivity. These products can serve as a useful supplementary calorie source during travel or temporary situations where live feeders are unavailable.

Regardless of which commercial products a keeper chooses to incorporate, the foundational principle remains that live insects should constitute the majority of a house gecko's caloric intake. Commercial diets and processed insect products are best viewed as supplements to a live feeding program rather than replacements for it. The hunting behavior stimulated by live prey is itself beneficial, providing exercise and mental stimulation that contribute to overall gecko health. Keepers who rely too heavily on processed foods may observe lethargy, reduced muscle tone, and behavioral changes associated with insufficient environmental engagement.

Calcium supplementation is the single most critical nutritional intervention for captive house geckos, and the market offers a range of calcium powder products with important differences in formulation. Pure calcium carbonate powder without vitamin D3 is the standard choice for routine dusting at most feedings. This form of calcium is safe for frequent use because excess calcium carbonate is poorly absorbed and passes through the digestive tract without causing hypercalcemia. Keepers should look for products that are finely milled to ensure even coating on small feeder insects, as coarse powders tend to clump and fall off before the gecko consumes the prey item.

Calcium with vitamin D3 is a separate product that should be used on a scheduled rotation rather than at every feeding. Vitamin D3 (cholecalciferol) is essential for intestinal calcium absorption, and unlike calcium carbonate, it is fat-soluble and can accumulate in the body to toxic levels if over-supplemented. The general recommendation for house geckos is to use calcium with D3 at one to two feedings per week, with plain calcium used at all other feedings. Geckos housed under appropriate ultraviolet-B lighting may synthesize some endogenous D3, which should factor into supplementation frequency, though the nocturnal habits of house geckos mean their natural UVB exposure is lower than that of diurnal species.

Multivitamin powders formulated for reptiles provide additional micronutrients including vitamin A, B-complex vitamins, vitamin E, and trace minerals such as zinc and manganese. These supplements are typically used once per week by dusting feeder insects lightly before offering. Vitamin A is a particularly important component for house geckos because deficiency causes squamous metaplasia of mucous membranes, leading to eye problems, respiratory infections, and impaired shedding. However, preformed vitamin A (retinol) is also fat-soluble and potentially toxic in excess, so keepers should follow product dosing guidelines carefully and avoid stacking multiple vitamin A sources.

The physical technique of dusting feeder insects affects how much supplement the gecko actually ingests. The standard method involves placing a small number of insects in a plastic bag or cup with a pinch of supplement powder, then gently shaking or swirling to coat the insects lightly and evenly. Over-dusting creates a thick, chalky coating that can deter feeding and may cause the gecko to associate the supplement taste with prey refusal. Under-dusting provides insufficient mineral delivery. The goal is a light, even film that does not visibly alter the color of the insect beyond a faint white or off-white haze. Dusted insects should be offered immediately because the powder begins to fall off within minutes as the insects groom themselves.

Liquid calcium and vitamin supplements represent an alternative delivery method that some keepers prefer for geckos that consistently refuse dusted prey. These liquid products can be added to drinking water, applied to feeder insects via a spray mist, or administered directly via dropper in precise doses. Water-soluble calcium products are generally less concentrated than powder forms, and the actual dosage consumed depends on how much water the gecko drinks, introducing variability. Direct oral supplementation with a dropper provides the most precise dosing but requires handling the gecko, which causes stress in a species that generally does not tolerate frequent contact well.

Gut-loading is the practice of feeding nutrient-dense foods to feeder insects for twenty-four to forty-eight hours before offering them to the gecko, effectively transforming the insect's digestive tract into a vehicle for delivering vitamins and minerals that the insect itself does not naturally contain in adequate quantities. This process is distinct from simply keeping feeder insects alive with basic maintenance food. A cricket that has been sustained on cardboard and potato slices in a pet store bin for a week is nutritionally hollow compared to one that has been purposefully gut-loaded with a high-calcium, vitamin-rich diet. Serious keepers consider gut-loading as important as external supplementation.

Commercial gut-loading products are available in dry, wet, and gel formulations, each with advantages depending on the keeper's setup. Dry gut-load diets are convenient and shelf-stable, typically composed of ground grains, legumes, calcium carbonate, and dried vegetable matter compressed into pellets or granules. Wet gut-load products provide both nutrition and hydration to the feeder insects, which is beneficial because well-hydrated feeders deliver more moisture to the gecko. Gel-based water replacement products infused with calcium and vitamins serve double duty by hydrating feeder colonies while simultaneously loading them with transferable nutrients.

Keepers who prefer to prepare their own gut-loading diets can achieve excellent results with fresh produce and pantry staples. High-calcium greens such as collard greens, mustard greens, dandelion greens, and turnip greens form an ideal base. These can be supplemented with butternut squash, sweet potato, carrots, and papaya for beta-carotene and additional vitamins. Small amounts of whole grain cereal, bee pollen, or spirulina powder can round out the nutrient profile. Foods to avoid in gut-loading mixes include spinach and beet greens, which contain high levels of oxalic acid that binds calcium and makes it unavailable, and citrus fruits, which can be toxic to some feeder insect species and may irritate gecko digestive tracts.

The timing and duration of gut-loading directly affect its efficacy. Feeder insects should be placed on the gut-load diet at least twenty-four hours before being offered to the gecko, with forty-eight hours being optimal for maximum nutrient transfer. Beyond forty-eight hours, the gut contents of many feeder species begin to shift as earlier material is digested and excreted, so there is no benefit to extended gut-loading periods. Insects should be removed from the gut-loading container, lightly dusted with calcium powder, and offered to the gecko promptly. Any uneaten insects left in the enclosure overnight will gradually lose their gut-load as they forage on substrate and enclosure debris.

Maintaining a dedicated gut-loading station separate from the main feeder insect colony simplifies the workflow considerably. A small, ventilated plastic container with a shallow dish of gut-load food and a water gel cup is sufficient. The keeper transfers the appropriate number of insects from the main colony into the gut-loading container one to two days before each scheduled feeding. This approach ensures that only properly gut-loaded insects reach the gecko while the bulk colony continues on its standard maintenance diet, which can be simpler and cheaper than premium gut-load formulations.

Feeding tongs are among the most useful tools for house gecko keepers, enabling precise prey delivery and allowing the keeper to observe feeding behavior up close. Stainless steel or bamboo feeding tongs with rounded, soft tips are preferred over sharp-edged tweezers, which can injure a gecko's delicate mouth if it strikes slightly off-target. Tongs between six and ten inches in length provide enough reach to present food items inside the enclosure without requiring the keeper to insert their hand fully, which can startle a skittish house gecko. Tong feeding also allows the keeper to monitor exactly how many items each gecko consumes, which is valuable for tracking appetite changes that may indicate health problems.

Escape-proof feeding dishes serve a different purpose, allowing keepers to offer slower-moving feeder insects like Dubia roach nymphs and black soldier fly larvae without them scattering throughout the enclosure. These dishes are typically smooth-walled ceramic or plastic vessels with inward-curving rims that prevent insects from climbing out. Some designs incorporate a textured exterior so the gecko can grip the outside while leaning in to hunt, which mimics the arboreal feeding posture natural to house geckos. Feeding dishes should be placed in a consistent location within the enclosure so the gecko learns to associate that spot with food availability, reducing search time and stress.

The placement and timing of food delivery should align with the house gecko's natural behavioral rhythms. As a nocturnal species, house geckos are most active and receptive to feeding during the evening and early nighttime hours. Offering food shortly after the enclosure lights dim or turn off capitalizes on the gecko's peak activity period and results in stronger feeding responses compared to daytime offerings. Some keepers use low-wattage red or blue nighttime bulbs during feeding sessions to observe their geckos without disrupting natural behavior, though house geckos generally feed readily in complete darkness once they detect prey movement through vibration and scent.

Removal of uneaten feeder insects is an often-overlooked aspect of feeding management that directly affects both gecko health and enclosure hygiene. Crickets left overnight in the enclosure will gnaw on sleeping geckos, causing skin abrasions and stress that can suppress appetite and immune function. Even non-biting feeders like Dubia roaches contribute to waste accumulation and bacterial growth if left for extended periods. Best practice is to remove all uneaten insects within twelve hours of offering, or to offer only as many feeders as the gecko will consume in a single feeding session. Tracking consumption patterns over several weeks allows keepers to calibrate portion sizes accurately.

Record-keeping tools, whether a simple notebook or a digital spreadsheet, help keepers maintain consistency in feeding schedules, supplement rotation, and portion tracking. Documenting the date, prey species, number of items offered, number consumed, and which supplement was used creates a longitudinal record that is invaluable for troubleshooting appetite loss, adjusting supplementation, and providing accurate dietary history to a veterinarian if health concerns arise. Several reptile-keeping community applications now offer digital feeding logs with reminder functions, though a basic written log taped to the enclosure stand works equally well for keepers who prefer simplicity.