The insect you choose determines a big chunk of your dragon’s calcium balance and protein intake — and the wrong choice (crickets fed straight from the bag, waxworms as a weekly staple, anything caught outside) ranges from quietly harmful to immediately lethal.
This guide covers every feeder worth knowing: full nutritional profiles including Ca:P ratio, protein, and fat; frequency by life stage; the size rule that prevents impaction; and the insects responsible for documented deaths. Bookmark it as a reference you’ll return to whenever you’re adding a new feeder to the rotation.
Quick Answer: What Insects Can Bearded Dragons Eat?
The best all-round feeder insect is the dubia roach (Ca:P 3:1; 36% protein; 7% fat). Strong alternatives: black soldier fly larvae for exceptional calcium, gut-loaded crickets for everyday variety. Treats only: hornworms, waxworms, superworms. Never feed fireflies — one or two can kill a bearded dragon within hours. Never feed wild-caught insects of any kind.
Feeder Insect Nutrition: The Full Comparison
The most important number in feeder insect nutrition is the calcium-to-phosphorus (Ca:P) ratio. Bearded dragons need calcium to exceed phosphorus in their diet because excess phosphorus blocks calcium absorption. Fat percentage is the second key metric — high-fat feeders cause obesity and fatty liver disease when used too often.
| Feeder Insect | Ca:P Ratio | Protein % | Fat % | Verdict |
|---|---|---|---|---|
| Dubia roach | 3:1 | 36% | 7% | ✅ Best daily staple |
| Black soldier fly larvae (BSFL) | 55:1 | 17% | 9% | ✅ Excellent supplement; limit per session |
| Silkworm | 2.1:1 | 64% | 10% | ✅ Excellent; harder to source |
| Hornworm | 1.1:1 | 9% | 1% | ✅ Hydration treat only |
| Cricket (gut-loaded) | 1:5 | 21% | 6% | ⚠️ Acceptable only if gut-loaded 24–48h before feeding |
| Superworm | 1:3 | 19% | 18% | ⚠️ Adults occasional only; hard exoskeleton |
| Mealworm | 1:7 | 20% | 13% | ⚠️ Adults occasional only; not for juveniles |
| Waxworm | 1:7 | 15% | 20% | 🔶 Rare treat only; addiction risk |
Nutritional data sourced from FireAndIceDragons Food Chart and ReptiFiles.
A dragon fed primarily crickets without gut-loading is receiving a calcium-negative meal every session. Crickets at Ca:P 1:5 deliver five times more phosphorus than calcium per gram — backwards from what a bearded dragon needs. Over weeks, that deficit drives metabolic bone disease. For how calcium supplementation fits into the picture, see the calcium supplement guide.
Feeder Insect Profiles
Dubia Roaches — The Best Daily Staple
Dubia roaches (Blaptica dubia) are the strongest all-round feeder insect for bearded dragons. Their Ca:P of 3:1 makes every session a net calcium positive. At 36% protein and just 7% fat, they support growth without loading the dragon with unnecessary fat. They don’t chirp, don’t smell noticeably, can’t climb smooth acrylic or glass surfaces, and can’t fly — escaped feeders are not a household problem.
Gut-load them with collard greens, dandelion, and squash for 24 hours before feeding and the nutritional profile improves further. Recommended sizes:
- Hatchlings (0–3 months): 1/4” dubias
- Juveniles (3–12 months): 1/2” dubias
- Adults (12+ months): 3/4”–1” dubias (never larger than the space between the eyes)
Regional note: Dubia roaches are regulated or banned in some Australian states (Western Australia, South Australia) due to biosecurity laws. Check local regulations before ordering.
Black Soldier Fly Larvae (BSFL / Calci-Worms / Phoenix Worms)
Black soldier fly larvae (Hermetia illucens) have the highest calcium-to-phosphorus ratio of any commonly available feeder: 55:1. Sold as Calci-Worms, Phoenix Worms, and similar brand names, they come pre-loaded with calcium at a level that exceeds what dusting alone can deliver — so they don’t require a calcium supplement when offered.
Soft-bodied and easy to digest, they’re well suited for hatchlings and juveniles. They’re also easy to store (refrigerate and they go dormant for weeks).
Limit per session: 5–10 BSFL per feeding. Their exceptional calcium content is a reason to use them as part of a rotation rather than as the only feeder — very high calcium as a proportion of total diet can cause its own imbalances. Mixed with dubia roaches and gut-loaded crickets, they’re an outstanding nutritional addition.
Don’t confuse BSFL with mealworms. They’re completely different insects with entirely different nutritional profiles.
Crickets — Only If Gut-Loaded
Crickets (Acheta domesticus) are cheap and available everywhere, which explains their popularity. The problem: their baseline Ca:P is 1:5. Without gut-loading, every cricket session is a calcium drain.
Gut-loading transforms them: feed your crickets collard greens, dandelion, mustard greens, squash, or pumpkin for 24–48 hours before offering them to your dragon. This shifts their nutritional output and makes them an acceptable rotation feeder.
A few more practical issues to know:
– Crickets can’t be stored long-term; they die off within weeks if not managed
– They’re noisy (relevant in shared living spaces)
– Escapes are common with careless handling
– Uneaten crickets left overnight can bite a sleeping dragon
Crickets aren’t the best daily staple, but gut-loaded crickets are a solid rotation option. For full gut-loading techniques and food lists, see the gut-loading guide.
Hornworms — Hydration Tool, Not Protein Source
Hornworms (Manduca sexta) are large, vivid blue-green caterpillars with around 85% water content and just 1% fat. When your dragon is mildly dehydrated or eating reluctantly on a hot day, 1–3 hornworms per session offers real hydration support.
What they’re not: a protein source. Ca:P of 1.1:1 with low absolute calcium means they contribute little nutritionally beyond moisture. Their protein (9%) is too low to anchor a feeding session.
Practical note: hornworms grow fast. Buy small and use them promptly — they can outgrow the size rule within days if left unfed.
Superworms — Adults Only, Occasional
Superworms (Zophobas morio) are large and visually engaging feeders that active adults hunt well. Protein at 19% is reasonable, but fat at 18% and Ca:P at 1:3 rules them out as a staple. Use them 1–2 times per month for adult dragons as enrichment feeding, not as regular nutrition.
Don’t feed to juveniles or subadults. The hard exoskeleton is harder for younger dragons to process.
Unlike mealworms, superworms cannot be refrigerated — cold kills them. Keep them at room temperature (75–80°F) with oat bedding.
Waxworms — Treat Only, With a Warning
Waxworms (Galleria mellonella) are the junk food of the feeder insect world: irresistible to dragons, nutritionally poor, and habit-forming. At 20% fat and Ca:P 1:7, they create obesity risk when overfed.
The bigger problem is waxworm addiction. Waxworms are extremely palatable — dragons find them hard to resist. Keepers who introduce them regularly often find their dragon subsequently refuses other feeders, including nutritionally appropriate dubias and crickets. The refusal can persist for weeks once established.
Limit to: 2 waxworms per session, 1–2 times per month maximum. Don’t use them to stimulate appetite in sick or underweight dragons without veterinary direction.
Mealworms — Adult Treat Only
Mealworms (Tenebrio molitor) have a hard chitin exoskeleton that poses impaction risk for juvenile dragons, combined with high fat (13%) and poor calcium ratio (Ca:P 1:7). Never feed mealworms to hatchlings or juveniles.
For healthy adults, occasional mealworms in a varied rotation are acceptable. Refrigerate in a shallow container with dry oat bedding to slow development.
Feeding Frequency by Life Stage
Insect feeding frequency changes substantially with age. Hatchlings and juveniles are in rapid growth mode and need protein regularly. Adults have shifted to a vegetable-dominant diet where insects are a supplement, not the centrepiece.
| Life Stage | Frequency | Session Details |
|---|---|---|
| Hatchlings (0–3 months) | 2x/day | As many appropriately sized insects as they’ll eat in 10 minutes |
| Juveniles (3–12 months) | 1x/day | 5–6 head-sized insects per session |
| Subadults (12–18 months) | Every other day | 10–15 insects per session |
| Adults (18+ months) | 2–3x/week | 3–4 head-sized insects per session; insects = 20–30% of total diet |
Frequency data from ReptiFiles’ bearded dragon diet guide.
A note on variability: These numbers are guidelines, not rules that override what your dragon is telling you. A dragon coming out of brumation may refuse food or eat far less than expected for 1–2 weeks. A gravid female may eat intensely and then drop off sharply before laying. An ill dragon recovering over several weeks won’t hit normal intake targets. Track weekly patterns; don’t stress over single-session refusals.
For how insect feeding fits into the full diet picture — including vegetable ratios by age — see the complete bearded dragon diet guide.
The Insect Size Rule
No insect larger than the space between the dragon’s eyes. No exceptions.
This measurement works because the esophagus diameter corresponds approximately to the gap between the eyes. An insect that exceeds this gap is a choking and impaction risk. Impaction — a blocked digestive tract — is a veterinary emergency; prevention is the only practical strategy.
Practical reference:
– Hatchlings: pinhead crickets, fruit flies, 1/4” dubias only
– Juveniles (3–12 months): 1/2” dubias, small crickets, BSFL
– Large adults (17–24”): 3/4”–1” dubias, full-sized crickets, superworms (occasional)
When in doubt, size down. A dragon eating smaller insects easily is safer than one struggling with insects at the size limit.
Insects Never to Feed
Fireflies and Lightning Bugs
This is the most important safety rule for feeder insect selection: never feed fireflies.
All firefly species (Lampyridae family) produce lucibufarin compounds — bioluminescent toxins that are acutely lethal to reptiles. The dose required for a fatal outcome is shockingly low: 1–2 fireflies have caused documented deaths in bearded dragons, with death occurring within hours. There is no antidote and no effective treatment once absorbed.
Lightning bugs are fireflies. Glowworms are firefly larvae. Any bioluminescent insect should be treated as firefly-equivalent.
If your dragon eats a firefly: Contact an exotic vet immediately. Don’t wait for symptoms — by the time visible signs appear, toxin absorption may already be at a lethal level.
Wild-Caught Insects
Never. Three reasons:
- Pesticide accumulation — systemic insecticides applied to gardens, lawns, and agricultural areas accumulate in insect tissue. Even low residue levels can cause neurological symptoms in small reptiles.
- Parasite transmission — wild invertebrates commonly carry nematodes and protozoa that can establish infections in your dragon.
- Species misidentification — fireflies, toxic beetles, and safe species can look similar, especially at dusk.
Bait Shop Insects
Intended for fish, not reptiles. May contain preservatives or be sourced without health standards. Don’t use them.
Dead Insects
Bacteria multiply fast in dead insect bodies at room temperature. Always offer live feeders; remove uneaten insects after 15–20 minutes.
Domestic Pest Insects
Houseflies, ants, and cockroaches caught indoors may have contacted pesticides, cleaning products, or other household chemicals. Don’t feed them.
Gut-Loading and Supplementation
Gut-Loading
Gut-loading means feeding your feeder insects nutritious food for 24–48 hours before they become a meal. Their digestive contents transfer directly to your dragon. A well-gut-loaded cricket delivers far better calcium and micronutrient value than a freshly caught one.
Best gut-load foods: collard greens, dandelion greens, mustard greens, squash, pumpkin, sweet potato. Avoid citrus and high-oxalate foods (spinach, beet greens) in gut-load mixes.
Crickets and superworms benefit the most from gut-loading because their baseline Ca:P is poor. Dubias and BSFL also improve, even though their baselines are already good. For detailed techniques and commercial options, see the gut-loading guide.
Calcium and Vitamin Dusting
Dust feeder insects immediately before offering them — not hours ahead. The powder shakes off quickly; you want it coating the insect at the moment it’s eaten.
Dusting schedule per VCA Animal Hospitals and canonical standards:
- Calcium (phosphorus-free): every feeding session
- Calcium with D3: 2–3 times per week
- Multivitamin powder: 1–2 times per week
Technique: place insects in a bag or small container with a pinch of powder, shake gently for 2–3 seconds, offer immediately.
Building a Feeder Rotation
No single feeder insect covers all nutritional bases. The practical approach:
Core rotation (daily feeders): Dubia roaches + gut-loaded crickets
Nutritional supplements: BSFL 2–3 times per week, mixed into sessions; silkworms when available
Occasional variety: Hornworms for hydration; superworms for adults 1–2x/month
Rare treats only: Waxworms (2 per session, max twice per month); mealworms for adults only
Never: Fireflies, wild-caught insects, bait shop insects, dead insects
A rotation of three or four feeders gives your dragon broader micronutrient coverage than relying on one insect type. It also prevents dietary dependence — the most important reason to avoid settling into crickets-only or dubias-only feeding.
For the plant side of this equation — vegetables and how they balance against insect feeding at each life stage — see the safe vegetables guide.
Frequently Asked Questions
Does this insects guide include gut-loading instructions?
This guide covers which insects to use and why — Ca:P ratios, life-stage suitability, and feeding frequency. Gut-loading technique, timing, and the best gut-load food choices are covered in the dedicated gut-loading guide. Both guides work together: this one helps you choose the right feeder; the gut-loading guide helps you maximise its nutritional value before it’s offered.
Does this guide specify how many insects to feed per session?
Feeder selection is this guide’s focus — not portion sizes or session frequency. For per-session quantities and weekly schedules broken down by life stage (hatchling, juvenile, adult), see the bearded dragon feeding schedule. Those figures work in direct combination with the feeder choices here.
Does the insect selection change if my dragon is overweight?
Yes — high-fat feeders (waxworms, hornworms, superworms) should be significantly reduced or eliminated for overweight adults. The fat bearded dragon guide covers the dietary reset approach, including which feeders to cut and how to replace the caloric gap with leaner options like dubia roaches during a weight management phase.
Is this guide relevant for juvenile dragons as well as adults?
Yes, with important age-specific restrictions. Mealworms and superworms are restricted to adults due to the tough exoskeleton impaction risk in younger dragons. These restrictions are noted for each feeder type in the guide. Life-stage suitability is a core part of the feeder selection framework, not an afterthought.
Does this guide cover the full diet, or only the insect component?
The insect component only — typically 15–30% of an adult dragon’s diet. For the vegetable and plant matter component (70–85% of the adult diet), see the safe vegetables guide. The main diet guide shows how both components integrate across all life stages.
Disclaimer
This guide is for educational purposes and general keeper reference only. It is not veterinary advice. If your bearded dragon shows signs of illness, unusual behaviour, or has consumed a potentially toxic substance such as a firefly or wild-caught insect, contact a qualified exotic animal veterinarian immediately. Individual nutritional needs vary by health status, life stage, and environmental conditions.
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