How to Care for Odontomachus infandus | The Philippine Trap-Jaw Ant Guide
Photo: Jonghyun Park, via iNaturalist, licensed under CC BY 4.0.
Odontomachus infandus is a big trap-jaw ant from the forests of the Philippines. Its workers hold their long jaws wide open, then snap them shut in a tiny fraction of a second to catch their prey.
Trap-jaw ants are fast, alert hunters and a real show to watch. They also need warmth, humidity and respect for their sting, so this guide explains Odontomachus infandus care step by step, from the day a colony arrives.
We have kept ants since 1997, and the care rules here are the same ones we use for our own trap-jaw ant colonies.
👉 In a hurry? Download our free Odontomachus infandus care sheet (PDF), open the Odontomachus infandus care sheet page or explore all our free ant care sheets.
Odontomachus infandus at a Glance
Also known as: a Philippine trap-jaw ant
Origin: the Philippines, mainly Luzon and Mindoro
Keeping level: Advanced, adults only
Queen: about 15 to 16mm, with lighter brown parts on her head and back
Workers: 12 to 16mm, dark blackish brown with a lighter brown head and long straight jaws
Colony: usually one queen, a few hundred workers
Nest temperature: 24 to 28°C all year
Nest humidity: 60 to 80%
Workers before moving into a nest: 10+
Food: a hunter: Protein Jelly, and scalded insects for established colonies
Winter: no hibernation, keep warm all year
Defence: a strong, painful sting
Meet the Philippine Trap-Jaw Ant
Odontomachus infandus is found only in the Philippines. It lives in many kinds of forest, from lowland rainforest to pine forest high in the mountains, but always in shade and humidity. It is not found in open land.
The workers hunt in the leaf litter on the forest floor. With workers up to about 16mm long, it is one of the larger trap-jaw ants, and its lighter brown head stands out against its dark body.
A trap-jaw ant can lock its jaws wide open, like a spring-loaded trap. Tiny trigger hairs on the inside of the jaws do the rest: when prey touches them, the jaws slam shut, one of the fastest movements in the animal kingdom.
The jaws are not only for hunting. A frightened worker can snap them against the ground and launch itself out of danger. Watching a hunt in the outworld is fascinating, but always from the outside of the glass.
As in other trap-jaw ants, a queen starts her colony in a semi-claustral way: she leaves her chamber to hunt while she raises her first workers. That is why a colony with workers is a much safer start than a lone queen.
Can You Keep Odontomachus infandus in the UK?
Odontomachus infandus comes from the Philippines, and Best Ants UK does not sell it. Ants from abroad may be illegal or impossible to import into the UK, and we never encourage importing ants.
This guide is for keepers who already look after this species where it is native, and for anyone curious about trap-jaw ants. The same care rules work for other trap-jaw ants too.
Safety First
Trap-jaw ants have a strong, painful sting. They are not aggressive, but this is an adults-only species. Never handle the ants and never let children open the setup.
Always use long tweezers when you feed or clean the outworld. Keep the lid closed and the PTFE band fresh, and work calmly so the ants stay calm too.
When a New Colony Arrives
The most important step: leave the parcel completely unopened, exactly as it arrived, at room temperature for 5 hours. The ants must adjust to the temperature slowly, because abrupt temperature changes make ants seriously unwell.
After the 5 hours, check the queen is safe and sound. Then leave the colony in its original packaging, with the test tube still in its tin foil and wrapping.
Put it somewhere quiet and still, away from daily household activity. Normal daylight is fine, but never direct sunlight.
Give the colony 4 to 5 days of complete rest. The ants are fed before dispatch, so they need nothing from you. Use this time to set up and water the nest. 👉 Our step-by-step ant farm setup guide shows you exactly how.
Still workers or a motionless queen after delivery are almost always delivery stress. Look at the queen's antennae: moving antennae mean she is fine. Almost all recover within 4 to 5 days, and a big queen can take a little longer.
Life in the Test Tube
Start with a colony, never a lone queen. Choose at least 10 workers with eggs, larvae or pupae laid inside that colony: the brood is your proof of a fertile queen.
Keep the colony in its test tube until it has at least 10 workers. Moved earlier, the workers scatter in the bigger space, and the queen and brood are left unprotected. That can lead to colony failure.
If you do care for a founding queen, give her a tiny drop of protein jelly, about half a grain of rice, once a week on a small flat piece of tin foil inside the tube, next to the dry cotton stopper. In our experience a fed queen does far better.
Trap-jaw ants need warmth even in the test tube. If your room is cool, warm the tube with a heating cable at the cotton stopper end only. Never lay a test tube on a heat mat.
Moving Into the Ant Farm
When the colony is big enough, connect the test tube to the nest with the delivery tin foil still on. Leave it like that for 14 days.
Then slide the foil back about 1mm every day, until the tube is fully exposed to daylight. Bit by bit, the tube becomes the bright spot and the dark nest becomes the safe home.
If the ants haven't moved 2 days after the tube is fully exposed, wrap the foil back on, wait another fortnight and repeat the whole process. Moving in happens on the ants' own time: anywhere from a couple of days to 6 months.
Once the colony has moved, leave the old test tube connected for at least another 14 days. Ants sometimes leave a little brood behind.
The red filter and black cover stay on the nest all the time, so it is pitch dark inside. You can lift the black cover once a day for 2 to 3 minutes, ideally at night, and take the red filter off once a week for 2 to 3 minutes.
Take colony photos at most once a month. Every extra disturbance stresses the queen.
The Best Ant Farm for Trap-Jaw Ants
Trap-jaw ants are quick and alert, so their home must be well made, escape-proof and easy to keep warm and humid.
Our top pick is the A7 Plus ant farm kit, linked at the end of this guide. Its pre-installed digital meter shows the nest temperature and humidity at a glance, which matters a lot for a forest species that needs steady warmth and moisture.
👉 As the colony grows into the hundreds, the bigger A6 ant farm kit with meter gives it more room, with a built-in meter too.
Place the ant farm in normal daylight, never direct sunlight: the sun can overheat a nest within minutes. Avoid windows, radiators and heaters, vibrating surfaces, speakers and TVs, and rooms with strong smells such as the kitchen.
Temperature and Heating
Odontomachus infandus comes from the tropical Philippines, so keep the nest at 24 to 28°C every day of the year. A UK home is too cool for them for most of the year.
👉 The Advanced Heating System Small 4W holds the nest steady with its digital thermostat. Set it to about 26°C, the middle of their range.
The heat mat goes under one quarter of the nest only, on the side opposite the watering area. The ants can then pick the spot they like best. Never heat the whole nest.
Warm the outworld too, because a big gap between nest and outworld confuses the ants. Aim for at least 21°C overnight, rising to about 28°C by day, ideally matching the nest or a degree or two cooler.
Water and Humidity
This is a species of shady, humid forest, so keep the nest humidity at 60 to 80%. Use distilled or purified water only. Never use tap water, rainwater or bottled mineral water, even boiled: they cause mould and fungus, which is deadly for ants.
Water the nest with the pipette provided. Pour slowly, a few drops at a time, through the watering hole. Stop as soon as 1 or 2 drops appear inside the nest. That is how you know it is done correctly.
Warm nests dry out faster, so check the meter often. Water about once a week, a little more in summer and a little less in winter, and always as soon as the nest humidity drops below 60%.
Never water the outworld. Keep it at about 50% humidity, like an average UK home. A watering test tube in the outworld gives the workers a safe drink.
Feeding Your Trap-Jaw Ants
Trap-jaw ants are hunters, and protein is the heart of their diet. Feed twice a week, in small amounts, in the outworld only. Remove leftovers after 2 days to stop mould.
🥩 For a young colony, 👉 Protein Jelly is the protein to use: we have tested it with trap-jaw ants. Keep protein jelly in the fridge at all times. Serve it on a small piece of tin foil or in a 👉 small feeding dish, so leftovers are easy to lift out.
Live food, such as small crickets or small cockroach nymphs, is only for big, established colonies, never small ones. Always scald it first: wearing gloves, hold it with tweezers in just-boiled water (above 90°C, no longer bubbling) for 10 to 15 seconds.
Then cut it in half only, and place it in the outworld with long tweezers. The workers still grab it with their snapping jaws, and feeding time is the best part to watch.
🍯 As a small extra, put a tiny drop of our 👉 organic ant honey or 👉 Ant Nectar in the outworld once or twice a week. Ant Nectar has even more carbohydrates than honey, and both are far better than sugar water or home-made mixes.
Keep Mites Out of Your Colony
Blood-sucking mites are one of the biggest dangers for any ant colony, and they are not rare. Insects are the main risk for a hunter: in our experience about half of the live food sold in pet shops or online carries mites.
Mites also arrive with bird seed from local shops and with dried mealworms, which are useless as ant food anyway. Buy ant food only from established, reputable ant-keeping suppliers, and always scald insects before they go in.
At Best Ants UK we clean our foods in several ways before dispatch, check every colony twice a month, and check each colony again before it leaves us.
Now and then, look at your queen with a magnifying glass. Tiny white or reddish specks on her joints and legs, together with ants dying fast, are a warning sign of blood-sucking mites.
Stopping Escapes
Trap-jaw ants are fast runners and can even jump, so escape prevention is a must. Paint a band of 👉 PTFE Fluon escape barrier around the top inner edge of the outworld lid. The ants slip off it and can't climb out.
PTFE wears off as the ants keep testing the same spots. For a small colony of up to about 100 ants, reapply it roughly every 4 weeks. For 300 to 500 ants or more, reapply it about every 2 weeks.
Never shake the bottle, because it foams. Roll it gently in your hands instead. Keep the lid closed at all times, except for the moment you add food.
Winter Care
Odontomachus infandus has no winter rest. Keep the nest at 24 to 28°C through every UK winter, with the heater doing the work on cold days.
Cold doesn't kill a colony at once. The ants get sick and die over the following days, so never let them cool down. Never put ants in a fridge, shed or garage, and avoid any abrupt temperature change.
Kept warm, the colony stays active, so keep feeding twice a week in winter. If the ants eat less, simply give less. The colony still grows a little more slowly in winter, because its biological clock can't be tricked.
Can I Release My Trap-Jaw Ants?
No. A colony raised indoors won't survive outside, and this tropical ant from the Philippines could never cope with a UK winter. If you ever can't keep your colony any more, 👉 visit our ant adoption page and let us know. We'll see whether we can take it in.
Frequently Asked Questions | FAQ
Is Odontomachus infandus good for beginners?
No. It is an advanced species for adult keepers. It needs steady tropical warmth, high humidity, a strong escape barrier and respect for its painful sting. For a first colony, Lasius niger or Messor barbarus is a far better start.
Can I buy Odontomachus infandus in the UK?
Best Ants UK does not sell this species. It comes from the Philippines, and it may be illegal or impossible to import into the UK. We never encourage importing ants. Choose a species that is legally kept and sold in the UK instead.
Do Odontomachus infandus sting?
Yes. The sting is strong and painful. They are not aggressive, but never handle them, keep the lid closed and always use long tweezers in the outworld. This is an adults-only species.
What temperature do Odontomachus infandus need?
Keep the nest at 24 to 28°C all year. In a UK home that means an Advanced Heating System set to about 26°C under one quarter of the nest, with a warm outworld too.
What do trap-jaw ants eat?
They are hunters that need plenty of protein. A young colony gets Protein Jelly, with a tiny drop of honey or Ant Nectar as an extra. Big, established colonies also get insects such as small crickets, scalded first and cut in half.
How many workers before moving trap-jaw ants into a nest?
At least 10 workers. Moved earlier, the workers scatter in the bigger space and the queen and brood are left unprotected, which can lead to colony failure.
Can trap-jaw ants jump?
Yes. When they are frightened, they can snap their jaws against the ground and flip themselves into the air. It is one more reason to keep the PTFE barrier fresh and the lid closed.
Ready for an Ant Colony of Your Own?
Odontomachus infandus is not sold by Best Ants UK, but the same care brings our tropical colonies to life.
👉 Start with the A7 Plus ant farm kit. Its pre-installed digital meter shows the nest temperature and humidity at a glance, and if you already have your ants, choose its Nest + Outworld option.
