What Do Ants Eat in Captivity? A Practical Feeding Guide for New Keepers

Feeding a captive ant colony sounds simple until you actually start. You set up the formicarium, you got your queen, and then you stare at the outworld wondering: what do ants eat in captivity, exactly? Sugar water? Insects? Both? How much? How often? Every beginner hits this wall, and most of the answers floating around online are either too vague or contradict each other.

I've been feeding colonies for over ten years. I've made plenty of mistakes along the way, including the time I overwrote a young Messor barbarus (Messor, the seed-harvesting ants) colony with protein and watched them dump half of it in their garbage pile within an hour. That was a fast lesson in portion control. Here's what actually works.

The Two Food Groups Every Colony Needs

Ants are omnivores in the wild, but their nutritional needs break down into two clear categories: protein and carbohydrates. Get both right and your colony grows. Neglect either one and you'll see problems fast.

Protein: what it does and where to get it

Protein is for the larvae. Worker ants can survive on sugars alone for short periods, but larvae need amino acids to develop properly. Without a consistent protein source, your colony stalls: eggs hatch, larvae stop growing, the queen slows her laying rate. In a well-fed colony, you'll notice brood developing noticeably faster during weeks when protein is plentiful.

The best protein sources for captive ants, roughly in order of how well they're accepted across most species:

• Mealworms (Tenebrio molitor larvae): widely available, easy to store, accepted by almost every species. Small mealworms or freshly molted ones (soft-bodied, white) work best for smaller colonies. Cut larger ones open to make the nutrients accessible.
• Fruit flies (Drosophila): ideal for founding queens and small colonies. Use flightless strains (D. hydei or D. melanogaster) so they can't escape your outworld. Tiny, perfectly sized, and ants love them.
• Crickets: great for medium to large colonies. Kill them first or freeze and thaw. Live crickets can stress a small colony and even injure workers if left unattended overnight.
• Boiled egg white: cheap, easy, safe. A pea-sized piece goes a long way. No seasoning, no oil, just plain boiled egg. It molds quickly, so remove uneaten portions after 24-48 hours.
• Cooked chicken or lean beef: small unseasoned pieces work fine. Avoid fatty cuts. Remove after 24 hours without fail.
• Freeze-dried insects: crickets, mealworms, waxworms sold for reptiles. Clean, long shelf life, easy to portion. Rehydrate slightly before offering if your colony is small.

What to skip: processed deli meats, seasoned foods, oily fish, anything with salt or preservatives. Ants will often take these anyway, but salt in particular causes real problems at higher intake levels.

Carbohydrates: the fuel that keeps workers running

Worker ants run on sugar. Foragers, nurses, soldiers: they're all burning glucose constantly. In the wild they get it from honeydew (produced by aphids), nectar, ripe fruit, and tree sap. In captivity, you replace all of that with a simple sugar solution.

The go-to is diluted honey or sugar water. Mix one part honey with four to five parts water. Pure honey is too concentrated and can cause gut issues; straight sugar water works but has zero other nutrients. Honey gives trace minerals and enzymes that plain sugar doesn't. If your colony is large enough to warrant it, commercial ant gel or liquid ant food sold for hobbyist use is a clean, no-mess alternative.

Fresh fruit also works: small pieces of apple, strawberry, grape, or melon. Ants get both sugar and water from fruit. It molds fast, so treat it like protein, remove anything left after 24 hours. Avoid citrus, which most species ignore anyway.

Live Prey vs. Dead Prey: Which One Is Actually Better?

This question comes up constantly, especially from keepers who've watched AntsCanada videos and want to recreate the dramatic live feeding moments. My honest take: for most beginner setups, dead prey is better. Here's why.

Live insects fight back. A single large cricket left overnight in a small outworld with fewer than 50 workers can injure or kill ants. I've seen it. The cricket gets cornered, starts kicking, and suddenly you have injured workers and stressed nurses abandoning brood near the entrance tunnel. Not worth it for a colony that's still getting established.

Dead or pre-killed insects are just as nutritionally valuable and carry zero risk of injury. Kill live insects before offering them, or buy freeze-dried feeder insects. A quick freeze for 24 hours works if you're using home-caught insects. Freezing also eliminates any parasites or pathogens from wild-caught prey, which matters more than most beginners realize.

That said, live prey does stimulate foraging behavior in a way that dead prey doesn't. Once your colony has a solid worker population, say 200+ workers for a medium-sized species like Lasius niger, offering an occasional live small cricket or fruit fly can be genuinely enriching. Watch closely and remove anything the colony isn't pursuing within 30 minutes.

How Often to Feed Your Colony (and the Mistake Everyone Makes)

New keepers almost always overfeed. It's natural: you're excited, you want your colony to grow fast, and offering food feels like the most direct way to help. But mold is the enemy of a young colony. Uneaten food left too long creates fungal outbreaks, humidity spikes, and sick ants. Pace yourself.

Founding queens in test tubes

A lone founding queen in a test tube needs almost nothing. She's drawing on her fat reserves and the nutrients from her dealated wings. If your queen is claustral (founding without needing food, which is the case for most common species like Lasius niger and Camponotus species), feed her nothing until she has her first workers. Then offer a tiny droplet of sugar water and a single small fruit fly or a sliver of mealworm no larger than a grain of rice. That's it. Once every 5-7 days is plenty at this stage.

Small colonies (under 50 workers)

Feed twice a week. One protein offering, one sugar offering, both small enough that they're mostly consumed within 24 hours. If you're finding leftovers every time, you're feeding too much. The colony size dictates the portion, not your enthusiasm.

Growing colonies (50-500 workers)

Three times a week works well here. Protein every other feeding, sugar available more consistently. At this stage you'll notice a clear foraging pattern: workers will come out faster and in larger numbers when there's fresh food available. That's a healthy sign. You can start sizing up portions when the previous offering is fully cleared within a few hours.

Large established colonies (500+ workers)

Daily or every other day, with more varied protein sources. Large colonies of species like Camponotus (carpenter ants) or Formica (wood ants) process food quickly and benefit from a wider range of protein types. Rotate between mealworms, crickets, boiled egg, and the occasional waxworm (high fat, use sparingly) to keep the diet balanced.

One more thing worth knowing: if you open the outworld and find uneaten mealworms still sitting there from the last feeding, that's real information. Either your colony is smaller than you assumed, or portions crept up without you noticing. Don't just remove the leftovers and feed again at the same amount. Cut the next serving in half, watch whether that gets cleared, and scale back up gradually. Persistent leftover protein is the fastest road to a mold problem, and mold is always harder to fix than it was to prevent.

Getting Your Feeding Setup Right

The food is only half of the equation when thinking about what do ants eat in captivity. Where and how you deliver it matters more than most guides admit. A proper outworld with a dedicated feeding area makes the difference between clean, healthy colonies and moldy, stressed ones.

Sugar water needs a feeder that won't overflow or tip. A small bottle cap works at the founding stage, but once you have 100+ workers, ants will crowd it, knock it, and spill it everywhere. A proper ant water feeder with a wick or a recessed reservoir keeps liquid contained and prevents drowning.

For protein, the feeder vessel itself is worth a moment's thought. Ceramic bowls are the best option here: they don't absorb odors the way plastic does, they rinse clean in seconds, and ants can approach from any angle without slipping. A 1.8 cm bowl sits neatly in a small outworld without dominating the space, and it holds a mealworm half or a pinch of freeze-dried crickets at exactly the right scale for small and medium colonies. Having a few on rotation so a clean one is always ready makes it much easier to stay on top of hygiene.

Foods That Are Actually Toxic to Ants

Most dangerous foods aren't things you'd deliberately feed ants. They're things beginners accidentally include because they seem natural or harmless. Here's what to keep out of your outworld entirely.

• Salt and heavily salted foods: disrupts water balance at the colony level. Even small amounts from processed deli meat can cause problems over repeated feedings.
• Spicy or pungent foods: chili, garlic, onion. These contain compounds that are genuinely toxic to insects at low concentrations. Ants usually avoid them instinctively, but don't test that assumption.
• Citrus in large amounts: occasional small pieces are unlikely to cause harm, but the limonene in citrus rinds is used as an insecticide. Stick to the flesh only and keep portions tiny.
• Pesticide-exposed insects: never feed wild-caught insects from areas where pesticides are used. Flies from a kitchen window, beetles from a treated garden. The ant workers will carry the contaminated food directly to the brood.
• Fatty meat: not acutely toxic, but unacceptable for different reasons. Fat goes rancid fast, molds quickly, and creates a foul-smelling problem that's hard to clean out of an outworld.
• Dairy products: ants can't process lactose. Milk, cheese, yogurt: skip all of it.

Feeding by Species: What Changes Between Common Captive Ants

The two-food-group rule applies universally, but the ratios shift depending on the species you're keeping. Not all ants have identical dietary needs, and understanding what do ants eat in captivity at the species level is what separates keepers who see steady brood development from those who keep wondering why growth stalled.

Lasius niger (black garden ant): balanced but sugar-heavy

Lasius niger colonies, probably the most popular beginner species in the hobby, run on a lot of sugar and moderate protein. Their natural diet leans heavily on honeydew from aphids, supplemented by small invertebrates. In captivity: sugar water available consistently, protein every few days. They're not picky. Mealworms, egg white, fruit flies: all accepted well.

Camponotus (carpenter ants): protein-forward

Camponotus species are larger and grow their colonies more slowly, but they need more protein per feeding relative to their size than Lasius. Their workers have notably larger crops and can store more liquid food, so sugar is still important, but a bigger protein offering keeps brood development moving. Waxworms work well for Camponotus as an occasional high-energy treat.

Messor barbarus (harvester ants): the grain exception

Messor barbarus, the seed-harvesting ants, are different from most species on this list. Their main carbohydrate source isn't sugar water: it's seeds. Grass seeds, hemp seeds, chia seeds, millet. They grind seeds into a paste called ant bread that feeds their larvae. You still offer protein (small insects), but sugar water plays a much smaller role than it does for other species. If you keep Messor and you've been skimping on seeds, that's likely why your brood development looks slow.

Formica (wood ants): active foragers that need volume

Formica species, common across North America and Europe, are high-energy foragers. Large established Formica colonies process food fast and need feeding more frequently than equivalent-sized Lasius colonies. They accept a wide variety of insects and are particularly enthusiastic about live prey once the colony is large enough to handle it safely.

"Feed the brood, not the colony. The workers take care of themselves."

A reminder that every protein feeding ultimately goes to larvae development, not adult worker energy

Building a Feeding Routine That Actually Sticks

The best feeding schedule is one you'll actually follow. Consistency matters more than perfection. Ants aren't going to collapse if you miss a feeding by a day, but a colony that's underfed for two weeks straight will show it in slower brood development and reduced foraging activity.

Pick two or three days a week and stick to them. Check the outworld before each feeding: is there anything left? Clear it out before adding fresh food. Rinse your feeder bowls with plain water (no soap, residue lingers and ants avoid it). Refill the water feeder station if the level is low. Then offer a small, appropriately sized protein piece and top up the sugar source.

That whole routine takes about three minutes once you're in the habit. The colonies that thrive long-term are almost always the ones whose keepers have made feeding a boring, predictable ritual. Not a big event, just a thing that happens on Tuesday and Friday and Sunday.

If you're still figuring out your overall setup and want a space that makes outworld feeding actually practical, the Ant Accessories collection has the feeder bowls, water stations, and tools that turn a chaotic feeding session into something clean and repeatable.

Frequently asked questions

What can I feed my pet ants if I don't have insects?+

Boiled egg white is the most accessible protein substitute available in any kitchen. Cut a piece no larger than a match head for small colonies, remove it after 24 hours. For sugar, diluted honey (1 part honey to 4-5 parts water) on a bottle cap works perfectly until you can source proper feeder insects. Freeze-dried crickets or mealworms from a pet store are also a clean, shelf-stable option that any beginner can use consistently.

What do ants eat when there is no food available?+

In captivity, a colony with no food access will first consume stored food held in worker crops (they share liquid food through trophallaxis, passing it mouth to mouth). If starvation continues, workers will prioritize feeding the queen and oldest larvae by cannibalizing younger eggs and early-stage larvae. Founding queens can survive weeks on their fat reserves and the energy stored in their now-unneeded flight muscles. This is why a claustral queen in a sealed test tube doesn't need food for the first several weeks.

What food is toxic to ants?+

Salted and heavily processed foods are the biggest practical risk, as salt disrupts ant physiology at colony scale. Pesticide-exposed insects are the most dangerous: wild-caught bugs from treated gardens or near roads can wipe out an entire colony if the contamination is high enough. Citrus rind compounds (limonene) are used as insecticides and should be avoided. Spicy foods containing capsaicin or allicin (chili, garlic, onion) are also harmful, though most ants will avoid them by instinct. Dairy products can't be processed by ant digestive systems.

How often should I feed my ant colony?+

It scales directly with colony size. A founding queen with her first workers: once every 5-7 days, tiny portions. Under 50 workers: twice a week. 50-500 workers: three times a week, alternating protein and sugar emphasis. Over 500 workers: every 1-2 days, larger and more varied portions. The clearest signal to increase feeding frequency is when food is completely consumed within a few hours instead of the usual 12-24. The clearest signal to reduce it is finding uneaten food every time you check.

Can ants drink plain water or do they only need sugar water?+

Ants need plain water for hydration, separate from sugar water. A dedicated water source in the outworld or a water tower built into the formicarium is non-negotiable. Sugar water provides energy but doesn't replace hydration. Without reliable water access, colonies can decline surprisingly quickly, especially in setups running at higher temperatures. If your formicarium has a water tower or water chamber, keep it topped up consistently: it matters more than any food you offer.

Why are my ants leaving food untouched in the outworld?+

A few things can cause this. The most common: you're offering too much and the colony simply doesn't need it all. Cut portions down to what gets cleared within 12-24 hours and go from there. It can also mean the food type isn't right for the species (remember that Messor species prioritize seeds over sugar water, for example). Occasionally it signals that the colony is entering a slower phase, such as cooling toward hibernation or a period of reduced queen laying. Always remove untouched food promptly rather than leaving it to mold, and adjust the next portion size down before adding anything fresh.