Polyrhachis muelleri

Few approachable spiny ants offer the scale this one does, which makes muelleri a good long-game project for a beginner who wants a colony that really grows. It comes from Australia and Papua New Guinea, where Polyrhachis live in trees and forage along trunks and foliage, so its arboreal manner is fun to watch. Easy and safe to keep, with no sting and only a mild bite, it lets you settle in before the numbers climb. A big colony from an approachable start.

Muelleri feeds like a typical arboreal Polyrhachis, fuelling its workers on sweet liquids while insect protein goes to the queen and brood. Keep carbohydrate constantly available and supply protein two to three times a week to support a colony that can grow large.

★★★ readily · ★★ moderately · ★ occasionally · ✗ not eaten

Found this Australian climber in a test tube or small humid nest, then plan for room, since numbers can reach up to 10,000 workers. Upgrade once the founding brood fills the chambers, choosing a moisture-retaining nest in aerated ytong or acrylic to hold the high humidity it needs. These strong climbers find any weak spot, so keep the arena rim well coated with fluon (PTFE), oil, or talc and water and refresh it often. ANTonTOP formicaria and starter kits cover the full path with a matched humid nest, arena and barrier as the colony grows.

Warm only one side so the ants can pick their preferred spot along a gradient. Keep the nest at 24-27 °C and the arena at 25-29 °C, with nest humidity at 70-85% and arena humidity at 60-75%. It is tropical with no hibernation, so feed and keep it active throughout the year, including winter.

Expect a steady Polyrhachis pace early on that picks up as the colony establishes, heading toward a mature size of up to 10,000 workers. You receive the queen plus workers and brood, ready to begin building in a warm, humid nest and arena.

• Polyrhachis reaches its greatest diversity in Australasia and tropical Asia, and the Australian fauna alone includes a wide array of spiny species.
• The body spines are armour, helping a worker resist being seized by birds, spiders and rival ants.
• As a formicine it has no sting and relies on formic acid and biting mandibles to defend the nest.

Is Polyrhachis muelleri suitable for beginners?

Yes, it is rated Beginner and needs no hibernation, so care is simple.

Does this Australian spiny ant need a winter rest?

No, it is tropical and active year-round; keep feeding without lowering the temperature.

Does Polyrhachis muelleri sting or bite?

No, there is no sting, only a mild bite.

How large can a muelleri colony become?

It can reach up to 10,000 workers.

How big is the queen?

The queen is 8-10 mm, with workers at 6-9 mm.

How quickly does this spiny ant grow?

It starts steady and speeds up as it establishes, reaching large numbers over time.

What should I feed it?

Sugar water or nectar plus insects such as crickets and flies.

How will it be shipped?

Queen, workers and brood with a season-matched heat or cool pack, sent within 24 hours with tracking.

Will it survive shipping?

Yes, colonies are packed with an appropriate heat or cool pack and dispatched quickly with tracking to protect them in transit.

Escape prevention. Coat the inner rim of every open arena with fluon (PTFE), or use talc-and-water or an oil barrier as a backup, and keep a tight, fine-mesh lid on top. Check the barrier regularly, since dust, condensation and feeding debris break a fluon line over time. Keep tubing connectors tight and seal any gaps in the nest.

Keeping reminders. Always offer fresh water and never let the nest dry out completely. Give carbohydrates continuously and protein a few times a week, and remove uneaten insect prey within 24 hours before it moulds. Keep the formicarium out of direct sunlight and away from constant vibration, which stresses a young colony. A water-filled test tube plugged with cotton makes an ideal spare incubator whenever you need one.

Before you buy – do not rehouse too early. Have a test-tube setup or a small formicarium with an outworld and a working barrier ready before your colony arrives. A founding colony grows slowly at first, which is normal. Moving a small colony into a large nest too soon invites mould, mites and stress, and the workers die off one by one. Keep the colony in its open test tube on the arena, plug the nest entrance with cotton, and open up the next chambers only once the colony fills roughly 10-15% of the space.

What we ship. Every colony ships with a live-arrival guarantee, backed by our 24h unboxing-video guarantee: if the queen does not arrive alive, we reship free. Parcels travel with DHL, InPost (PL) or EMS, with a heat or cold pack to suit the season, packed discreetly and securely. We ship across the EU and worldwide, with free shipping over the Europe threshold.