Big-Headed Ant Care Sheet
Big-headed ants (Pheidole) grow faster than almost anything else we keep, and they produce a second worker caste with an oversized head. That combination makes them one of the best first colonies and one of the most fun to watch. This is the care we give our own, from a USDA-licensed breeder.
Why are some workers so much bigger-headed?
Because Pheidole has two worker castes from one queen. Ordinary minors do the foraging and brood care. Majors - sometimes called soldiers - have huge heads and jaws used to crack seeds and defend the nest.
Majors are the whole appeal, and they take time. A founding colony is all minors; majors arrive as the colony builds numbers. Seeing the first one is the sign your colony has turned the corner.
How fast do big-headed ants grow?
Fast - among the quickest we sell. That is what makes them forgiving for a first colony: they build numbers quickly enough that a small mistake does not end the colony, and there is visible progress week to week.
The benchmark is still a new batch of workers every 45-60 days. If that is not happening, something in heat, humidity or protein is off - get in touch.
What temperature do big-headed ants need?
One warm end at 82-85°F, the other end at or near room temperature. It must be a gradient across the setup, never the whole nest heated, so the colony can move brood to the temperature it needs.
Use a heat cable. Only a heat cable. Not a heat mat, not a lamp, not a windowsill. Mats and lamps heat too broadly, which destroys the gradient, and they dry the nest out or cook it. Below 80°F at the warm end, growth stalls.
Heat is for the brood, not the ants. If your colony moves away from the cable, that is usually correct behaviour.
What do big-headed ants eat?
They take both seeds and insect protein, which is unusual and convenient. A small seed mix in the outworld gives the majors something to do, and you will find husks in a midden pile - that is normal.
Red Ant Drank stays available at all times as their carbohydrate source, on a wet cotton or PVA wick - never an open pool, because they drown in it.
For protein, offer fresh killed feeder insects only. Never frozen, never protein gel. Store-bought crickets are fine. Do not feed honey, fruit, dog food or table scraps.
How do I keep the humidity right?
Fill the test tube reservoirs with water and plug each with a PVA sponge. That is your humidity for 90 days or more, with no nest maintenance in between.
PVA over cotton, every time: cotton grows mould over the weeks a founding tube sits undisturbed, and mould is a leading killer of young colonies. Keep the water end cooler than the warm end so it does not dry out.
Is my colony dying, or is it just winter?
Slowing down is normal. Not moving is not, if you are above 55°F.
The reliable test: ants in diapause move slowly when disturbed. Dead ants curl up and show no movement at all, even lifted with featherweight forceps.
There is mould in the tube. What do I do?
Do not panic - ants are far hardier than people expect. Set up a fresh test tube and do a normal transfer. If the colony is already in one of our nests, swap the bad tube for a freshly set up one and leave the old tube in the outworld until it empties over a few days.
Common mistakes that kill big-headed colonies
- Heating the whole nest instead of one end
- A heat mat or lamp instead of a cable
- Letting the warm end sit below 80°F
- Expecting majors in the first weeks
- Cotton plugs left to mould through the founding stage
- Frozen feeders or protein gel
- Combining two colonies, or letting two share an outworld
- Handling them. Ants are not meant to be held.
Which big-headed ants do we keep?
Pheidole bicarinata.
Where can big-headed ants be shipped?
Live ant shipping is restricted by state, and the approved list is per species. Each listing shows exactly which states that species can ship to - check the listing before ordering. We are a USDA-licensed breeder and we do not ship outside what we are permitted to.
Shop big-headed ants
Questions about your setup? Email antopiausa@gmail.com - we would rather answer early than replace a colony later.