Bearded Dragon Diet: Discoid Roaches vs Katydids, and Why It's Not Close

Every so often a keeper asks me whether they should feed katydids — usually because they've seen one in the garden and figured a free, natural-looking bug must be good for their dragon. It's a reasonable instinct and a genuinely bad idea, and the comparison with a proper staple like the discoid roach is the clearest way to explain why. This isn't a close contest, but walking through why it isn't close teaches one of the most important rules in reptile keeping: where your feeders come from matters as much as what they are.

So here's the full head-to-head — what each insect is, how the nutrition compares, the practical realities of sourcing each, and the safety issue that decides the whole thing. By the end you'll know exactly what to build your bearded dragon's diet on, and why the katydid in your yard should stay in your yard.

Why feeder choice drives a dragon's health

Bearded dragons are omnivores, and their diet shifts with age: insect-heavy as babies and juveniles, then mostly plants as adults (a healthy adult eats roughly 70–80% greens and vegetables). But across every stage, insects are the protein engine, and the insects you choose set three things that compound over years: protein and fat intake, calcium status, and digestive ease.

That makes the feeder decision one of the highest-leverage choices you make. And it's not only about the numbers on a nutrition chart — it's about reliability and safety. A feeder you can buy clean, in quantity, and improve through gut-loading is worth more than a theoretically nutritious bug you can't source safely. Hold that idea; it's the hinge of this whole comparison.

Meet the two contenders

Discoid roach (Blaberus discoidalis)

The discoid is a tropical roach from Central and South America, an inch and a half to two inches as an adult, flat, oval, and glossy. It's the workhorse feeder of the hobby for concrete reasons: adults can't climb smooth vertical surfaces, so they're easy to contain; they're live-bearers with no fragile egg cases; they have a soft, low-chitin body that's gentle on digestion; and they gut-load beautifully. They're farm-raised at scale, breedable at home, low-odor, silent, and legal in Florida where dubia roaches are restricted. Everything about the discoid is built for reliable, safe, everyday feeding.

Katydid (family Tettigoniidae)

Katydids are leaf-mimicking relatives of crickets and grasshoppers — the long-legged, long-antennaed green (sometimes brown) insects you hear calling on summer nights. Biologically they're not a bad food: like other orthopterans they're generally high in protein and not especially fatty, and a dragon would happily eat one. The trouble is everything around the katydid as a feeder: there's essentially no commercial katydid supply, which means any katydid you'd actually offer is wild-caught — and wild-caught is where the danger lives.

The nutrition, side by side

Approximate, as-fed figures — directional, not lab-exact, because the relationships are what matter (and because, as you'll see, the katydid's numbers are largely beside the point):

On paper, the protein and fat columns look broadly competitive — that's the part that tempts people. But look at the sourcing column, because that's the one that actually decides this. The discoid is a clean, controllable, improvable feeder. The katydid, in any realistic scenario, is a wild insect of unknown exposure history. One of those is a staple; the other is a gamble.

Both, like nearly every feeder, are calcium-poor and phosphorus-heavy, so both would need calcium dusting — proper UVB plus calcium-dusted feeders is what prevents metabolic bone disease, as the Merck Veterinary Manual on reptile nutrition explains. But you can only reliably do that gut-load-and-dust routine with a feeder you control, which is the discoid.

The deciding factor: the danger of wild-caught insects

This is the heart of the comparison, and it applies far beyond katydids. I have a firm rule: I don't feed wild-caught insects to my dragons. Here's why, in order of how much each risk worries me.

Pesticides. This is the big one. Insects from yards, gardens, parks, and especially anywhere near agriculture are routinely exposed to insecticides — that's the whole point of those chemicals. A katydid that's contacted even a trace of pesticide can carry it straight into your dragon, and reptiles are small enough that a dose harmless to the environment can be dangerous to them. You have no way to know a wild insect's exposure history. With a wild katydid, you're rolling dice you can't see.

Parasites. Wild insects are a major route for internal parasites. Many reptile parasites have life cycles that pass through insect hosts, and a wild-caught bug is far more likely to be carrying something than a clean farm-raised feeder. Importing a parasite load into your dragon for the sake of a "free" bug is a bad trade.

Identity and toxins. Misidentification is a real risk for non-experts. Some insects are toxic, some sequester plant toxins, some mimic safer species. A katydid is usually a katydid, but the broader habit of grabbing wild bugs invites genuine mistakes — and even among katydids, large species can deliver a sharp bite.

Farm-raised feeders like discoid roaches sidestep all three at once: known clean diet, controlled conditions, no pesticide exposure, far lower parasite risk, and a known identity. That's not a small advantage you weigh against nutrition — it's the whole reason the responsible hobby feeds cultured insects.

Why the discoid wins as a staple

Set the safety issue aside for a moment and the discoid still wins on the merits as an everyday feeder:

Balanced everyday nutrition. High protein for growth and maintenance, moderate fat that won't fatten the dragon, and a soft low-chitin body that digests cleanly enough to feed daily to a juvenile.

You can improve it. Because discoids actively eat, you gut-load them — 24–48 hours on quality produce and grain — and that nutrition passes to your dragon. You cannot meaningfully gut-load a wild katydid you caught an hour ago.

It's reliable and breedable. Buy in bulk, or set up a warm bin and breed your own indefinitely. They don't climb out, don't smell, and don't chirp. When I start or top up a colony I order well-started stock from All Angles Creatures' discoid roach collection; for the full setup, see my discoid roach keeping playbook.

It's legal where dubia aren't. For Florida keepers, the discoid is the staple roach that stays compliant.

The only real knock — low calcium — is true of every feeder and is solved by dusting. There's simply no category in which a wild-caught katydid beats a clean, gut-loaded, calcium-dusted discoid.

"But katydids are natural" — addressing the instinct

The appeal of wild bugs is the "natural diet" instinct: surely a dragon eating bugs it might encounter in the wild is more natural than one eating farmed roaches? Two problems with that.

First, Pogona vitticeps is an Australian species; a katydid in a North American garden was never part of its natural diet anyway. "Wild" doesn't mean "ancestrally appropriate."

Second, and more important, the captive environment changes the calculus entirely. A wild dragon eating wild insects in a pesticide-free outback isn't comparable to you handing your pet a bug from a suburb soaked in lawn treatments and mosquito spray. The "natural" framing ignores the contamination that defines the modern landscape your katydid actually came from.

If what you're after is dietary variety and enrichment — a genuinely good goal — you get all of it from safe, farm-raised feeders. That's the better way to honor the instinct.

How to add variety the safe way

Variety is good for dragons; wild-caught bugs are not the way to get it. Here's the rotation I use instead:

• ◆Staple: discoid (or dubia) roaches, gut-loaded and calcium-dusted, sized no wider than the space between the dragon's eyes.
• ◆Rotation feeders: crickets for variety, black soldier fly larvae for their naturally better calcium, the occasional superworm or butterworm as a treat, and hornworms for hydration.
• ◆Greens, daily: a salad of dragon-safe greens and vegetables — collard, mustard, and dandelion greens, squash, bell pepper — which becomes the bulk of an adult's diet.

That rotation delivers every kind of variety a dragon needs — different textures, movement for enrichment, a spread of nutrients — with zero pesticide or parasite roulette. It's more variety than a yard full of katydids, and all of it is safe.

The verdict

Discoid roaches versus katydids isn't a close call, and the reason is worth internalizing because it generalizes to every feeder decision you'll make: a clean, reliable, improvable, farm-raised feeder beats a theoretically-nutritious wild-caught one every single time. The discoid is a balanced, safe, breedable staple you can gut-load and dust and feed with total confidence. The katydid is a wild insect of unknown pesticide and parasite history with no commercial supply — a novelty that's not worth the risk no matter how its raw nutrition looks on a chart. Build your bearded dragon's diet on discoid roaches, add variety from other farm-raised feeders, keep the adult diet greens-forward, and leave the katydids in the garden where they belong.

Make the discoid your staple with the complete discoid roach keeping playbook. For more feeder head-to-heads, see discoid roaches vs termites vs butterworms, or browse the full exotic animal care library.