Asian Marauder Ant

The standout trait is extreme worker polymorphism. Minor workers measure just 1.3–2.5 mm, are yellowish reddish-brown, and have rectangular heads. Major workers (soldiers), by contrast, have heads roughly 12 times larger than the minors, with dry body weight differing by as much as 550-fold. Majors are reddish-brown to black, with nearly square heads and large triangular mandibles. Between these two extremes lies a continuous range of intermediate worker sizes.

Widely distributed across Asia, from India and Sri Lanka through Southeast Asia to southern China and Indonesia. It lives in soil or under rocks, typically in open fields or agricultural land. Colonies build permanent, structurally complex underground nests. Unlike true army ants, Carebara diversa doesn't relocate constantly — instead, workers build covered soil-particle tunnels along their foraging routes between the nest and food sources.

The main challenges are the very high humidity requirement and the sheer amount of food a growing colony demands, since major workers eat far more than minors — plan enclosure space and feeding budget well in advance. The colony size figure given here (10,000–50,000 workers) reflects a large but commonly seen mature colony, not a maximum; the six-figure or million-worker numbers sometimes cited elsewhere describe extreme, very large wild colonies, not what's typical in a kept colony.

Good to Know

The English name "Marauder Ant" comes from its long foraging columns, reminiscent of true army ants, even though it doesn't relocate its nest constantly the way army ants do. The extreme worker-size variation in this species makes Carebara a go-to example for myrmecologists studying allometric division of labor — how insect societies assign tasks based on body size.

Minor workers of Carebara diversa are often seen "hitchhiking" on the backs of much larger major workers during long foraging trips — one of the strangest sights in any ant foraging column.

Colonies forage in long columns along pheromone trails, hunting small insects while also collecting sugary honeydew from aphids. One study found that over 94% of workers failed to cross an obstacle on their first attempt, though the column eventually found a way around it. Young minor workers typically start out on brood care before moving on to other roles. A single colony can host as many as 16 queens living together.

An aggressive, cooperative group hunter, feeding mainly on insects such as crickets and roaches. Feed consistently every day — food scarcity stresses the colony and can lead to brood cannibalism. Ideal temperature is 26–30°C and shouldn't drop below that, since this species has no dormancy period. Humidity needs to stay very high, at 70–90%, with good ventilation. Eggs develop into minor workers in just 3–4 weeks, driving rapid colony growth.