How to Care for Pheidole sinica | The Giant Asian Big-Headed Ant Guide
Updated: 3 days ago
Pheidole sinica is a giant among big-headed ants. Its soldiers are about twice the size of those of Pheidole noda, with huge heads and strong jaws, and the whole colony hunts as a team.
Drop food in the outworld and the minors swarm it within seconds, while the soldiers march out to deal with anything tough. This guide explains Pheidole sinica care step by step, from the day your parcel arrives.
We have kept ants since 1997. Everything here comes from our own colonies and the care rules we use every single day.
👉 In a hurry? Download our free Pheidole sinica care sheet (PDF) or open the Pheidole sinica care sheet page for the key facts at a glance.
Pheidole sinica at a Glance
Origin: southern China (Hunan, Guangdong and Guangxi)
Keeping level: Intermediate
Queen: about 12mm, dark brown
Workers (minors): about 4.5mm, reddish brown to yellowish brown
Soldiers (majors): 8 to 9mm, reddish brown, with a huge head
Colony: one queen, a few thousand workers
Nest temperature: 24 to 28°C, all year round
Nest humidity: 50 to 70%
Workers before moving into a nest: 50+
Winter: no hibernation, never let them get cold
Escape risk: high, so a PTFE barrier is a must
Meet the Giant Big-Headed Ant
In the wild, Pheidole sinica lives in open land, woodland and woodland edges in warm southern China. It nests in the soil and under stones, and you may still see its old name, Ceratopheidole sinica, in older books.
A colony has two kinds of worker. The minors are the quick all-rounders: they forage, clean and look after the eggs, larvae and pupae (the brood).
The soldiers, also called majors, are the stars. Their heads are enormous, and their jaws crush hard insects and seeds that the minors can't open. They also guard the nest.
These are bold ants. They react strongly when their nest is disturbed and often attack other colonies, so every colony needs its own ant farm. A healthy queen can live for 10 years or more.
When Your Ants Arrive
The most important step: leave the parcel completely unopened, exactly as it arrived, at room temperature for 5 hours. The ants must adjust to your home's 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, somewhere quiet and still, away from daily household activity. Daylight is fine, never direct sunlight.
Give the colony 4 to 5 days of complete rest. The ants were 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 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 big queens can take a little longer.
Life in the Test Tube
Every Pheidole needs far more workers than most ants before it moves into an ant farm. Keep the colony in its test tube until it has at least 50 workers.
Moved too early, a small group is lost in the bigger space: the workers can't care for the queen and brood, and the colony dies. The same 50+ rule applies to a queen bought on her own.
A queen on her own still needs a little food. Once a week, give her a tiny drop of protein jelly, about half a grain of rice, on a small flat piece of tin foil inside the tube, next to the dry cotton stopper.
In our experience a fed queen raises her first workers faster, and the queen and colony do far better afterwards. Keep her tube wrapped in its foil and disturb her as little as possible.
A colony still in its test tube needs warmth too. Use a heating cable only, placed at the cotton stopper end of the tube. Never stand 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. If the ants haven't moved 2 days later, wrap the foil back on, wait another fortnight and repeat. Moving in can take 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, as ants sometimes leave brood behind.
The red filter and black cover stay on the nest all the time. 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 once a month at most.
The Best Ant Farm for Pheidole sinica
👉 Our pick is the A7 Plus ant farm kit, the same setup we recommend for Pheidole noda. Its pre-installed digital meter shows nest temperature and humidity at a glance, which makes heating and watering far easier.
If you already have your ants, choose the Nest + Outworld option. Give the colony good airflow in the outworld and a lid that always closes properly.
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
For this species, heating is the most important part of the whole setup. Pheidole sinica comes from warm southern China and needs the nest at 24 to 28°C, all year round.
A UK home is far cooler than that for most of the year. 👉 The Advanced Heating System Small 4W holds a steady warm spot with its digital thermostat. Set it to 26°C, in the middle of the 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.
In the outworld, aim for about 18°C overnight up to 28°C by day. By day it should ideally match the nest or be a degree or two cooler. Because the nest is heated, warm the outworld too: the Small 4W can warm a small outworld as well.
Water and Humidity
Keep the nest humidity at 50 to 70%. 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.
Water about once a week. A heated nest dries a little faster, so check it more often in summer. With a meter, simply water when the nest humidity drops below 50%.
Never water the outworld. Keep it dry, at about 50% humidity, like an average UK home. A watering test tube in the outworld gives the workers a safe drink.
Feeding Your Pheidole sinica Colony
Once the colony grows, these ants eat a lot. Feed twice a week, in small amounts, in the outworld only. Remove leftovers after 2 days to stop mould.
🍯 For energy, give our 👉 organic ant honey or 👉 Ant Nectar, which has even more carbohydrates than honey. Honey and Ant Nectar are far better than sugar water or home-made mixes.
🥩 For the queen and brood, give 👉 Protein Jelly or 👉 Cricket Mash. Keep protein jelly in the fridge at all times.
🌾 The soldiers enjoy cracking a few small seeds now and then, such as sesame or millet. Put them on a piece of tin foil or in a 👉 small feeding dish in the outworld. Never put seeds straight on the substrate, where they can sprout.
Live food, such as crickets or locusts, 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 serve it in the outworld. Never chop it smaller, and skip mealworms. The soldiers drag small pieces into the nest, the workers can't carry the remains back out, and mould follows.
Keep Mites Out of Your Colony
Blood-sucking mites are one of the biggest dangers for any ant colony, and they are not rare. They often arrive with bird seed from local shops, dried mealworms (useless as ant food), and live food from pet shops or online, where about half carries mites.
Buy ant food only from established, reputable ant-keeping suppliers. 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.
A home freezer won't kill all the mites in seeds, so never rely on it. We freeze our seeds below -60°C in a special freezer before they reach you. Live food always gets the scalding step above.
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
Pheidole sinica are excellent escape artists, 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 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. And never leave the outworld lid open, even for a moment.
Winter Care
Pheidole sinica has no hibernation. Keep the nest at 24 to 28°C right through winter, with the heating system running. The colony still slows down a little, because its biological clock can't be tricked.
Never let this colony get cold. Never put ants in a fridge, shed or garage, and avoid any abrupt temperature change.
If the colony slows down in winter, feed a little less, but never guess. At 22 to 26°C, give about half the summer amount, still twice a week.
Can I Release My Ants?
No. A colony raised indoors won't survive outside, and this warm-climate species 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 Pheidole sinica good for beginners?
It is an intermediate species. The colony needs steady heating all year, a fresh PTFE barrier and a keeper who doesn't mind a bold, fast ant. For a very first colony, Lasius niger or Messor barbarus is easier.
How many workers does Pheidole sinica need before moving into a nest?
At least 50 workers. A smaller group can't care for the queen and brood in a bigger space and the colony fails. Keep it in the test tube until it reaches 50. The same rule applies to a queen bought on her own.
What temperature do Pheidole sinica need?
Keep the nest at 24 to 28°C all year round. In a UK home that means an Advanced Heating System under one quarter of the nest, running through every season.
Do Pheidole sinica hibernate?
No. This warm-climate ant has no hibernation and must never get cold. The colony slows down a little in winter anyway, but the heating stays on.
What do Pheidole sinica eat?
Organic honey or Ant Nectar for energy, Protein Jelly or Cricket Mash for the queen and brood, and a few small seeds such as sesame or millet for the soldiers. Feed twice a week, in the outworld only.
Are Pheidole sinica soldiers dangerous?
They can give a hard pinch with their big jaws, and the workers have a small sting, but they are no danger to people. As with every ant, never handle them.
Can I keep two Pheidole sinica colonies together?
No. They are very aggressive towards other ants and often attack other colonies. Always give each colony its own ant farm.
Ready to Start Your Giant Big-Headed Ant Colony?
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