Can Crested Geckos Eat Hornworms? Safety, Prep & Frequency
Safe — OccasionallyFeeding frequency: monthly
Hornworms are safe and nutritious for crested geckos, delivering high moisture and a favorable calcium-to-phosphorus ratio rarely seen in feeder insects. Offer them no more than once or twice a month — excess water intake from overfeeding causes chronic loose stools and masks true hydration status.
How to Prepare
- Source hornworms exclusively from a reputable captive-bred feeder-insect supplier. Wild hornworms feed on tomato, tobacco, and other Solanaceae plants, accumulating tropane and nicotine alkaloids that are acutely toxic to reptiles — never collect from the garden.
- Gut-load captive hornworms for 24–48 hours on high-calcium, low-oxalate greens (collard greens, dandelion leaves, squash) before the feeding session to maximize the nutrient transfer your gecko receives.
- Select a worm no wider than the space between your crested gecko's eyes, offer it via feeding tongs or a shallow escape-proof dish, and remove any uneaten worm within 30 minutes — hornworms grow rapidly and an oversized specimen can injure a small gecko's jaw.
Warnings
- Never feed wild-caught hornworms. Solanaceae-fed specimens accumulate alkaloids — including nicotine analogs — at levels documented to cause acute toxicity in lizards (Boyer & Scott, Reptile & Amphibian Medicine, 3rd ed.).
- Hornworms are roughly 85% water by weight; making them a staple feeder causes persistent loose stools, electrolyte imbalance, and obscures dehydration cues your gecko would otherwise display.
- Hornworms do not replace a calcium-D3 supplement. Despite their 1.2:1 Ca:P ratio, total calcium per worm is low in absolute terms — continue dusting all feeder insects with phosphorus-free calcium-D3 powder per ARAV supplementation guidelines.
- Discard uneaten hornworms promptly; left in the enclosure overnight they can chew on a sleeping gecko, and decaying worm matter spikes ammonia levels.
Nutrition Facts
| Moisture | ~85% |
| Crude Protein (DM) | ~9% |
| Crude Fat (DM) | ~3% |
| Calcium | ~46 mg/100g |
| Phosphorus | ~39 mg/100g |
| Calcium:Phosphorus Ratio | ~1.2:1 |
FAQ
- How often can I feed my crested gecko hornworms?
- One to two feedings per month is the standard recommendation. Hornworms make an excellent hydration-boosting treat during warmer months, but their high water content dilutes overall dietary nutrition when offered more frequently. Treat them like fruit — enjoyable and beneficial in rotation, not as a daily staple.
- Are hornworms better than dubia roaches for crested geckos?
- They serve different roles. Dubia roaches are a high-protein, moderate-fat staple ideal for regular feeding sessions. Hornworms are soft-bodied, low-fat, and exceptionally high in moisture, making them better as a refreshing treat, a recovery food for sick or dehydrated geckos, or a palatability booster for picky feeders. Rotating both provides meaningful dietary variety — see the full breakdown on our crested-gecko-diet page.
- Do I still need to calcium-dust hornworms before feeding?
- Yes. Hornworms have a relatively favorable Ca:P ratio (~1.2:1) compared to most insects, but the absolute calcium quantity per worm remains low. ARAV husbandry guidelines recommend light phosphorus-free calcium-D3 dusting on all feeder insects regardless of their inherent ratio. A light coat — not a thick white crust — is sufficient.
- Can juvenile crested geckos eat hornworms?
- Yes, with appropriate sizing. Baby hornworms under 1 cm are ideal for juveniles and hatchlings; their soft cuticle poses minimal impaction risk. Apply the eye-width sizing rule strictly — a worm wider than the gecko's eye-to-eye skull measurement should not be offered until the gecko grows into it.
- My crested gecko ignored the hornworm — what should I do?
- Neophobia toward active feeders is common, especially for geckos raised on CGD (crested gecko diet) powder. Try offering at dusk when your gecko is most active, use feeding tongs to animate the worm gently, or place the worm in a small cup inside the enclosure. Repeated low-pressure exposure over several feeding nights resolves most refusals without forcing the gecko.
More Crested Geckos Foods
- Can crested geckos eat grapes?
- Can crested geckos eat strawberries?
- Can crested geckos eat blueberries?
- Can crested geckos eat apples?