Hornworms vs Other Feeder Insects: Best Options for Anoles
I keep anoles, and they are tiny, fast-metabolizing visual hunters — which makes feeder choice matter more than for almost any other lizard. Hornworms get hyped as a near-perfect anole food. They're useful, but the usual write-up oversells them on calcium and undersells how watery they are. Here's how they actually compare to the feeders you'll really build a diet around.
What anoles need from a feeder
Anoles are insectivores with high metabolisms and small bodies. They need:
- Protein for muscle and growth — the macronutrient that drives the diet.
- Moisture, because much of their water comes from prey and they often won't drink from a standing dish.
- Calcium with vitamin D3, dusted onto feeders, to prevent metabolic bone disease (MBD). This is non-negotiable.
- Appropriately small, moving prey — they hunt by sight, so motion triggers the strike, and the item must be no larger than the gap between the eyes.
Variety covers the gaps in any single feeder. No one insect does it all.
What hornworms actually are
Feeder hornworms are the larvae of Manduca sexta, the tobacco hornworm — not the tomato hornworm (Manduca quinquemaculata), despite the common mix-up. The ones sold as feeders are reared on a sterile artificial diet, which matters: wild hornworms feeding on tomato, pepper, or tobacco plants accumulate solanaceous toxins and should never be fed.
Their defining trait is water. Hornworms run about 85% moisture, with roughly 9% protein and very low fat. They're soft-bodied, brightly colored, and they move — all of which makes them irresistible to anoles and easy to digest.
You can source captive-bred feeders from All Angles Creatures' hornworm collection.
The calcium myth, corrected
You'll constantly read that hornworms have a "favorable calcium-to-phosphorus ratio." Treat that with suspicion. Like virtually every feeder insect, hornworms are phosphorus-heavy and do not supply the 2:1 calcium-to-phosphorus ratio an anole needs. Their water content also dilutes whatever minerals they do carry.
The practical rule: dust hornworms with calcium + D3 just like you dust crickets. The one true calcium-rich exception among feeders is black soldier fly larvae — not hornworms. Skip the dusting on the assumption that hornworms are "balanced" and you risk MBD.
Hornworms vs the staples
| Feeder | Moisture | Protein | Notes for anoles |
|---|---|---|---|
| Hornworm | ~85% | ~9% | Hydration treat; soft, easy to digest; needs dusting; grows out of size fast |
| Cricket | ~65-70% | ~20% | Affordable staple; active (triggers hunting); needs gut-load + dusting |
| Dubia roach (small) | ~65% | ~20-23% | Nutrient-dense, soft-bodied, quiet, odorless; size the nymphs down for anoles |
| Mealworm | ~60% | ~18% | High chitin, hard shell; impaction risk; occasional only |
| Black soldier fly larvae | ~60-65% | ~35-45% | The genuinely calcium-rich feeder; doesn't move, so hand-feed |
Crickets are the practical backbone of an anole diet: cheap, the right size range (pinheads for juveniles up), and their movement drives the hunt. Their weakness is a poor calcium-to-phosphorus ratio, so gut-load 24-48 hours ahead and dust before feeding.
Small dubia roaches are arguably the best single staple — high protein, low fat, soft exoskeleton, no smell or noise. Size matters: use small nymphs so an anole can manage them.
Mealworms are convenient but hard-shelled and chitin-heavy; for an animal as small as an anole they're an occasional item, not a staple, because of impaction risk.
Black soldier fly larvae are the calcium standout, but they don't move much once placed, so visual hunters like anoles often ignore them unless hand-fed.
How to feed hornworms to anoles
- Size first. No wider than the gap between the eyes. Hornworms grow shockingly fast, so a fine worm on Monday can be oversized by Thursday. Buy small, feed soon.
- Dust them. Calcium + D3, 2-3 times a week as part of your overall supplement routine. Daily for fast-growing juveniles.
- Use them as a treat or for hydration, once or twice a week, or when an anole looks dry. Don't make them the staple — 9% protein won't sustain growth.
- Cut waste. They're pricier than crickets and short-lived at feeder size. Buy what you'll use within the week and keep them cool to slow their growth.
Best-practice anole diet
Build the rotation around dusted crickets and small roaches for protein, rotate in hornworms for hydration and soft-bodied variety, and add black soldier fly larvae as your calcium-forward item (hand-fed if your anole won't chase them). Dust with calcium/D3 several times weekly, gut-load whatever you can, and offer only what the anole eats in a 15-20 minute window. Mist the enclosure daily so they can drink off leaf surfaces.
That's the whole game: hornworms are an excellent hydrating treat, not a staple, and they need calcium dusting like everything else.
See also dried black soldier fly larvae for the one feeder that does carry its own calcium, or browse the full exotic animal care library. For the underlying science on calcium, D3 and MBD, the Merck Veterinary Manual on nutrition in reptiles is the reference I lean on.