Opisthopsis rufithorax Care Guide: Keeping the Australian Strobe Ant

Nov 2

3 min read

Opisthopsis rufithorax is one of Australia's strobe ants: a striking orange and black ant with big eyes and a very funny way of moving. Outside the nest, workers run in quick, jerky bursts, as if they are under a strobe light, and they follow every movement with their eyes. It is a demanding species: founding is difficult and the colony needs warmth all year. But once a colony gets going, it grows quickly. Curious about how these ants see and move? Read our strobe ant facts.

At a glance

Origin: open forests and woodland across Australia, and New Guinea
Difficulty: advanced
Colony structure: a young queen starts her colony on her own
Workers: small, all about the same size
Growth: slow at first, then fast
Colony size: medium, up to several hundred workers
Temperature: warm all year
Humidity: moderate
Winter rest: none
Most important point: warmth, warmth and more warmth

Appearance

Opisthopsis rufithorax worker with a black head, orange thorax and orange and black gaster on a leaf — An Opisthopsis rufithorax worker.

Workers have a black head with large eyes, an orange thorax and an orange gaster with a black tip. The eyes are unusually big and sit towards the back of the head, which gives these ants a very wide view. All workers are about the same size.

Where does it live?

Opisthopsis rufithorax is found across large parts of Australia and in New Guinea, in open forests and woodland. Colonies nest in the ground, but the workers forage alone during the day on the ground and high up on tree trunks. They are shy: when approached, they quickly dart to the other side of the trunk or simply drop to the ground.

The strobe walk

Outside the nest, workers move in quick bursts: run, stop, run, stop. During each stop they tap the ground with their antennae. Inside the nest they move normally, so you will only see the famous strobe walk in the outworld.

Founding: the hard part

Opisthopsis rufithorax worker at the entrance of its nest in the soil — A worker at the nest entrance.

A young queen starts her colony on her own after the nuptial flight. Founding queens and very young colonies are sensitive, so keep the queen in a warm, closed test tube and disturb her as little as possible until the first workers arrive. Our test tube guide shows how to set one up.

Growth

Getting started takes patience. Once the colony has a stable group of workers and enough warmth, it grows quickly and can reach several hundred workers. Every colony is different, so we do not give timelines.

Warmth: the most important point

This species needs a lot of warmth, all year round. Use a Heat Mat with Temperature Controller on one side of the setup and keep it warm consistently. Still leave a slightly cooler area so the ants can choose, and keep in mind that the setting on a heat mat is not the temperature inside the nest. Watch where the workers keep their brood: that tells you where they feel best.

Humidity

Keep the humidity moderate: part of the nest slightly moist, the rest dry. Always provide clean water.

No winter rest

Opisthopsis rufithorax does not need a winter rest and stays active all year. Keep the colony warm in winter too.

Feeding

Orange and black Opisthopsis rufithorax on a blade of grass — Opisthopsis rufithorax on a blade of grass.

Sugar: offer sugar water or Sugar Jelly.
Protein: small flying insects such as fruit flies work best. These ants hunt by sight, so moving prey is easy for them to find. Freeze wild-caught insects first.
Leftovers: remove leftovers before they mould.
Water: always provide clean water.

Housing

Founding queen: a warm, closed test tube until the first workers arrive.
First workers: connect the test tube to a Mini Outworld to give the colony a small foraging area.
Larger colony: do not move them to a large nest too quickly. Give them a small nest once there are a few dozen workers, and size up step by step as the colony grows.
Escape prevention: they climb well, so always apply Fluon to the outworld. Read more in our anti-escape guide.

Is Opisthopsis rufithorax right for you?

If you already have experience with several colonies, can give warmth all year and would love to watch one of the most unusual ants in the hobby, Opisthopsis rufithorax is a fantastic species. Have a look at our Opisthopsis rufithorax colonies.

Sources

AntWiki. Opisthopsis rufithorax.
Ramon Cabrera, G. M., 2025. Foraging ecology, navigation and the visual systems of the strobe ants, Opisthopsis. PhD thesis, Macquarie University.
Waters, J. and McGlynn, T., 2018. How strobe ants do the strobe run. Myrmecological News. Summary on Small Pond Science.