Choosing the Best Feeder Insect for Your Bearded Dragon: A Keeper's Complete Guide
I've kept and bred feeder insects for years, and the question I get more than any other from new bearded dragon owners is some version of "which bug do I buy?" It sounds simple, but it's actually the question that quietly decides whether your dragon grows up lean and strong or ends up overweight with weak bones. Feeders aren't interchangeable. They swing wildly in protein, fat, moisture, calcium, and how hard they are to digest, and the right answer depends on your dragon's age, the rest of its diet, and what you're trying to accomplish.
This is the complete framework I use to choose feeders, written for someone standing in front of a wall of bug cups with no idea what to grab. I'll walk you through how a bearded dragon's needs change with age, the difference between a staple and a treat, the real nutrition numbers (with the common myths corrected), how to size and prepare feeders, and a bug-by-bug breakdown of every common option. By the end you'll be able to build a feeding plan instead of just buying whatever the pet store happens to stock.
What a bearded dragon actually needs from its food
Bearded dragons (Pogona vitticeps) are omnivores from the arid interior of Australia, and the single most important thing to understand is that their diet changes dramatically as they age. A hatchling and a five-year-old adult are almost different animals nutritionally.
- Hatchlings and juveniles (0–12 months) are growing explosively and need a lot of protein. In this stage, insects make up the majority of the diet — roughly 70% protein/insects to 30% greens is a common target — fed multiple times a day.
- Adults (18+ months) have largely stopped growing and flip the ratio: somewhere around 70–80% greens and vegetables to 20–30% insects, with protein offered every other day or a few times a week.
The reason this matters for feeder choice is simple: a fatty feeder that's fine as an occasional treat for a growing juvenile becomes a genuine health risk when fed daily to a sedentary adult. Obesity and fatty-liver disease are everywhere in captive dragons, and they almost always trace back to too much fat and too much protein in adulthood.
Two nutrients sit at the center of every feeder decision:
- Protein builds muscle and fuels growth. Critical for juveniles, still needed but moderated for adults.
- Calcium, balanced against phosphorus, builds and maintains bone. A calcium shortfall (or an imbalance where phosphorus outweighs calcium) causes metabolic bone disease (MBD) — soft bones, deformities, tremors, and eventually death. MBD is the most common serious nutritional disease in pet reptiles, and it is almost entirely preventable. The target dietary ratio is roughly 2 parts calcium to 1 part phosphorus.
Here's the catch that drives half of this guide: nearly every feeder insect is phosphorus-heavy, not calcium-heavy. That's why dusting with calcium powder is non-negotiable no matter which bug you pick. You'll see breathless claims online that this or that feeder has a "favorable calcium-to-phosphorus ratio" — treat almost all of those claims with suspicion. A handful of feeders (notably black soldier fly larvae) are genuinely calcium-rich; the rest need help.
The other piece is UVB lighting. Dragons need UVB to synthesize vitamin D3, which is what lets them actually absorb the calcium you're feeding. Diet and lighting work together — perfect feeders under no UVB still produce MBD. For an authoritative primer on reptile nutrition and MBD, the Merck Veterinary Manual's section on reptile nutrition is the reference I point keepers to.
Staples vs. treats: the most important distinction
If you take one organizing idea from this guide, make it this: feeders fall into two buckets, and mixing them up is the most common feeding mistake.
A staple is a feeder you can offer regularly — even daily for juveniles — without causing harm. Staples are high in protein, moderate or low in fat, reasonably digestible, and not dominated by water. They form the backbone of the protein side of the diet.
A treat (or supplemental feeder) is something you offer occasionally for variety, enrichment, hydration, or a specific purpose. Treats are usually too fatty, too low in protein, or too watery to carry the diet alone. Fed sparingly they're great; fed as staples they cause problems.
| Bucket | Feeders | Why |
|---|---|---|
| Staples | Dubia roaches, discoid roaches, crickets, black soldier fly larvae | High protein, moderate/low fat, digestible |
| Treats | Hornworms, silkworms | Mostly water / lower protein — hydration & variety |
| Occasional / treat only | Superworms, mealworms, "giant" mealworms, waxworms, butterworms | High fat or hard-shelled — fatten and risk impaction |
| Avoid as feeders | Wild-caught insects, fireflies, katydids/grasshoppers from outside | Pesticides, parasites, toxicity |
The whole art of feeding is building a rotation around one or two good staples and sprinkling treats in for variety. A dragon raised on a roach staple with the occasional hornworm for hydration and a superworm now and then as a treat is getting almost exactly what it needs.
The real nutrition numbers (and the myths)
Published nutrition figures for feeder insects bounce around because the values depend heavily on what the insect was fed, its life stage, and whether numbers are reported "as fed" (wet) or on a dry-matter basis. So treat the table below as approximate, as-fed figures — the relationships between feeders are reliable even when the exact percentages aren't.
| Feeder | Protein | Fat | Moisture | Shell / digestibility | Role |
|---|---|---|---|---|---|
| Dubia roach | High (~20–23%) | Moderate (~7–9%) | ~60–65% | Soft, low chitin — easy | Staple |
| Discoid roach | High (~20%) | Moderate (~6–8%) | ~60–65% | Soft, low chitin — easy | Staple |
| Cricket | Moderate (~18–20%) | Low–moderate (~6%) | ~70% | Higher chitin | Staple / variety |
| Black soldier fly larvae | Moderate (~17–18%) | Moderate (~9–14%) | ~60% | Soft; genuinely calcium-rich | Staple |
| Silkworm | Low–moderate (~9–13%) | Very low (~1–3%) | High (~76–83%) | Very soft | Treat / variety |
| Hornworm | Low (~9%) | Low (~3%) | Very high (~85%) | Very soft | Hydration treat |
| Superworm | Moderate (~18%) | High (~15%) | ~60% | Hard head capsule | Treat |
| Mealworm / "giant" mealworm | Moderate (~18–20%) | High (~12–15%) | ~60% | Hard, chitinous | Occasional |
| Waxworm | Low (~14%) | Very high (~20%+) | ~60% | Soft | Rare treat |
A few myths worth killing right here, because you'll see them repeated everywhere:
- "Discoid/dubia roaches have a favorable calcium-to-phosphorus ratio." Mostly false. Roaches are decent feeders, but like nearly all insects they run phosphorus-heavy. You still dust. The reason to choose roaches is high protein, low chitin, and easy keeping — not calcium.
- "Discoids are high in chitin." Backwards. Roaches have a soft, low-chitin exoskeleton compared with crickets and mealworms — that's exactly why they're easy to digest.
- "Giant mealworms are a separate, more nutritious species." No. "Giant" mealworms are usually ordinary mealworms (Tenebrio molitor) treated with a juvenile-hormone analog that stops them pupating so they keep growing. They're not superworms (Zophobas morio), and the hormone treatment is a reason for caution, not a feature.
- "Black soldier fly larvae don't need calcium dusting." This one's actually close to true — BSFL really are calcium-rich and are the one feeder where you can ease off the calcium dust. They're the exception that proves the rule.
Sizing feeders: the rule that prevents most disasters
There's one sizing rule and it's worth tattooing on your hand: no feeder should be wider than the space between your dragon's eyes.
Oversized prey is the leading cause of two serious problems:
- Choking, which is exactly what it sounds like and can be fatal in minutes.
- Impaction, where a chunk of hard-to-digest exoskeleton (or a feeder that's simply too big to process) blocks the gut. Impaction is a slow, dangerous emergency.
Hatchlings need genuinely tiny feeders — pinhead crickets, small roach nymphs, the smallest sizes you can find. As the dragon grows, the feeder grows with it. When you're unsure, always size down. A dragon will happily eat six small feeders instead of one big one, and six small ones are far safer.
This is also where roaches earn points: because feeder roaches come in a continuous range of nymph sizes, one colony or one supplier covers a dragon from hatchling to adult. You're never stuck between "too small" and "too big."
Gut-loading: the step that makes any feeder better
Here's a truth most new keepers miss: what the insect ate becomes what your dragon eats. A cricket starved in a cup for a week is a nearly empty calorie. The same cricket fed well for two days before feeding is a tiny nutrition package.
Gut-loading means feeding your feeders a nutrient-dense diet for 24–48 hours before you offer them to your dragon. A good gut-load includes:
- Fresh produce: collard greens, dandelion greens, mustard greens, carrots, squash, sweet potato.
- A dry protein/grain base or a commercial gut-load product.
- A clean moisture source (water crystals or moist veg), never an open dish the insects drown in.
Avoid gut-loading with anything you wouldn't feed your dragon: no avocado, onion, citrus-heavy items, or anything salty or processed. And obviously nothing exposed to pesticides — wash produce first.
Gut-loading does more for your dragon's long-term health than almost any supplement, and it works on every feeder, staple or treat.
Dusting: closing the calcium gap
Gut-loading broadens nutrition; dusting fixes the specific calcium shortfall that nearly every feeder has. The routine:
- Plain calcium (no D3): most feedings, if your dragon has good UVB.
- Calcium with D3: on a lighter schedule, or if UVB is marginal — but don't stack D3 carelessly, because fat-soluble vitamins can build up to toxic levels.
- Multivitamin: once or twice a week.
To dust, drop the gut-loaded feeders into a cup or bag with a little powder and gently swirl until they're lightly coated, then feed promptly before it falls off. Light coating, not a snowstorm — over-supplementing is its own problem.
A reasonable default for most setups: dust with plain calcium roughly 4–5 times a week, a calcium/D3 or multivitamin once or twice a week, and adjust based on your UVB and a vet's input. For the underlying science on why calcium and D3 balance matters, the University of Florida IFAS Extension's reptile care resources are a solid non-commercial reference.
The staples, one by one
Dubia and discoid roaches
These are the feeders I steer almost everyone toward as a primary staple. They're high in protein (~20%), moderate in fat, and have a soft, low-chitin body that's easy to digest and gentle on a juvenile's gut. They don't climb smooth walls, they barely smell, they're quiet, and they come in every size from pinhead to two-inch adult. Roaches also gut-load exceptionally well.
The main difference between them is legality and breeding speed. Dubia are restricted in Florida; discoids are the legal go-to there. Dubia breed a bit faster. Nutritionally they're near-interchangeable. If you want a deep dive on keeping a colony, see my discoid roach breeding playbook.
Crickets
The classic feeder. Crickets are a perfectly good staple — moderate protein, moderate fat, decent moisture — and they're cheap and available everywhere. The downsides are real, though: they're loud, they smell, they die easily, they escape, and they have more chitin than roaches so they're slightly harder to digest. They also can bite a dragon if left loose in the enclosure overnight. Fine as a staple, just higher-maintenance than roaches.
Black soldier fly larvae (BSFL, "calci-worms," "phoenix worms")
The quiet overachiever. BSFL are the one common feeder that's genuinely calcium-rich with a calcium-to-phosphorus ratio that actually favors calcium — the rare feeder you don't have to dust as aggressively. They're small, soft, easy to keep, and don't pupate quickly at room temperature. The catch is size: they're small, so they're better as a calcium-boosting staple in rotation than as a single main feeder for a big adult.
The treats and hydration feeders
Hornworms (Manduca sexta)
Spectacular hydration treats. Hornworms are ~85% water, very soft, low in fat, and bright green and wriggly enough to tempt a picky or dehydrated dragon. They're also calcium-decent. But at only ~9% protein they cannot carry a diet — they're a treat and a hydration tool, not a staple. They grow fast and are pricey and perishable. Buy commercially raised ones only; wild hornworms feed on toxic nightshade-family plants.
Silkworms (Bombyx mori)
A premium soft-bodied feeder. Silkworms are very low in fat, easy to digest, hydrating, and relatively higher in calcium than most insects — genuinely one of the better treats, especially for juveniles, gravid females, and recovering dragons. They're fussy to keep (they want mulberry leaves or silkworm chow and specific warmth) and don't live long, so most keepers buy them as needed rather than breeding them.
Superworms, mealworms, and "giant" mealworms
The fat trap. Superworms (Zophobas morio) are big, fatty (~15% fat), and have a hard head capsule — fine as an occasional treat for adults, dangerous as a staple. Mealworms (Tenebrio molitor) are fatty and hard-shelled. "Giant" mealworms are just mealworms treated with a juvenile-hormone analog to grow bigger — extra reason to keep them occasional. None of these belong in a daily rotation.
Waxworms and butterworms
Pure candy. Extremely high fat, very palatable. Use them as a rare treat, to fatten a recovering dragon, or to hide medication — never routinely.
Feeders to never use
- Wild-caught insects of any kind: pesticide and parasite risk that isn't worth it.
- Fireflies/lightning bugs: genuinely toxic, can kill a dragon.
- Katydids, grasshoppers, and other field insects: hard-shelled, often wild-caught, and not worth the parasite/pesticide gamble when clean feeders are cheap.
Building your dragon's actual feeding plan
Pulling it all together, here's how I'd set up a plan:
For a hatchling/juvenile:
- A staple roach (discoid or dubia), appropriately tiny, fed 2–3 short sessions a day — as many as they eat in ~10–15 minutes, then remove the rest.
- Finely chopped greens available daily.
- Dust most insect feedings with calcium.
- Hornworms or silkworms a couple times a week for variety and hydration.
For an adult:
- Greens and veg as the daily base (collard, mustard, dandelion greens; squash; bell pepper).
- A staple roach every other day or a few times a week, in measured amounts.
- A hornworm for hydration or a superworm as a treat occasionally — not daily.
- Calcium dusting on insect days; multivitamin once or twice weekly.
Year-round: keep fresh water available, gut-load everything, size every feeder to the eye-gap rule, and watch body condition. A lean, active dragon with a flat belly and strong limbs is the goal; a round, sluggish one means cut the protein and fat and lean on greens.
When you're ready to stock up, All Angles Creatures carries the full range of live feeder insects — staples and treats sized for everything from hatchlings to big adults — so you can build the rotation above from one place.
Sourcing and the mistakes that quietly hurt dragons
Buy from suppliers who keep clean, healthy colonies. Lethargic, mite-ridden, or dead-on-arrival feeders are a sign of poor husbandry, and dirty feeders can carry pathogens. Look for active insects across a range of sizes.
The feeding mistakes I see most:
- Feeding too big. The eye-gap rule exists for a reason.
- Overfeeding protein/fat to adults. The fast lane to obesity and fatty liver.
- Skipping calcium or UVB. The fast lane to MBD.
- Feeding only one bug. Even a great staple alone leaves gaps; rotate.
- Wild-caught anything. Just don't.
- Leaving uneaten insects in the enclosure. Crickets and superworms can bite a sleeping dragon.
Get those six right and the specific brand of bug barely matters.
The short version
Build the protein side of the diet around a soft, high-protein staple — discoid or dubia roaches first, with crickets and BSFL in support. Treat hornworms and silkworms as hydration and variety, and superworms, mealworms, and waxworms as occasional treats only. Gut-load everything for 24–48 hours, dust with calcium to fix the universal phosphorus skew, size every feeder to the space between the eyes, and shift from protein-heavy (juvenile) to greens-heavy (adult) as your dragon grows. Do that and you've solved the "which bug?" question for good.
Next, compare the staples head-to-head in my breakdowns of discoid roaches vs. silkworms and discoid roaches vs. hornworms, or browse the full exotic animal care library.