Dorylus bequaerti

Dorylus bequaerti

Dorylus bequaerti is a species of army ant found across central and southern Africa, from the Democratic Republic of Congo down to South Africa ^[1]. Workers are small at 2-5mm, typical of army ants, with the characteristic dark reddish-brown to black coloration common to the genus ^[1]. As a Dorylus species, these ants are famous for their massive colony structure and raiding behavior, they form enormous colonies that conduct coordinated raids on other ant colonies and arthropods, sweeping through their territory like a moving army ^[1].

What makes Dorylus bequaerti particularly interesting is its colony structure. Like all Dorylus species, they have ergatoid queens, wingless queens that never leave the nest to mate, instead mating occurs within the nest and new queens may be produced from existing workers or the queen herself ^[1]. Their colonies can reach millions of workers, making them one of the most impressive social structures in the ant world. However, their specialized predatory lifestyle and enormous space requirements make them one of the most challenging ants to keep in captivity ^[1].

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Afrotropical region, Democratic Republic of Congo, Mozambique, and South Africa. They inhabit forest floors and savanna ecosystems where they can conduct their massive ground raids ^[1].
• Colony Type: Colonies contain a single ergatoid (wingless) queen that never leaves the nest. The colony structure is massive, potentially millions of workers making this one of the largest ant colonies known. They are nomadic, regularly moving their bivouac (temporary nest) as food sources are depleted ^[1].
  • Colony: Monogyne
• Size & Growth:
  • Queen: Ergatoid queens are wingless and significantly larger than workers, typically 15-25mm based on genus patterns.
  • Worker: 2-5mm ^[1].
  • Colony: Colonies can reach into the millions of workers, Dorylus colonies are among the largest in the ant world ^[1].
  • Growth: Fast, army ant colonies grow rapidly once established due to continuous brood production.
  • Development: Approximately 4-6 weeks at tropical temperatures based on genus patterns. (Development is rapid compared to most ants, army ants have evolved fast development to support their nomadic lifestyle)
• Antkeeping:
  • Temperature: Keep at 24-28°C (tropical range). They require consistently warm temperatures year-round.
  • Humidity: Moderate to high humidity (60-80%). They prefer humid forest floor conditions but need good ventilation to prevent mold in captive setups.
  • Diapause: No, as a tropical species, they do not hibernate. However, colony activity may slow slightly during cooler dry seasons in their native range.
  • Nesting: In nature, they create temporary bivouacs in hollow logs, under stones, or in underground chambers. They are constantly on the move, abandoning nests every few weeks. In captivity, they need space to form large clusters and must be allowed to relocate periodically.
• Behavior: Extremely aggressive predators. They conduct coordinated raids in massive columns, overwhelming other ant colonies and capturing brood and adults. They are primarily nocturnal or crepuscular, with raids often occurring at night. Workers are small but numerous, and they will readily attack anything that threatens the colony. Escape prevention is critical, they will rapidly disperse and establish new bivouacs if given any opportunity to escape. Their bite is noticeable but not medically significant for healthy humans ^[1].
• Common Issues: massive space requirements make them nearly impossible to house properly in typical ant setups, predatory nature means they will attack and consume any other insects, making them difficult to keep in multi-species setups, nomadic lifestyle requires frequent relocation, captive colonies may decline if unable to move, colonies can quickly become stressed in small enclosures and may abandon brood, they are extremely difficult to acquire as they cannot be collected like typical ants, queens are ergatoid and don't fly, making nuptial flights nonexistent

Understanding Army Ant Biology

Dorylus bequaerti belongs to the army ant subgroup of Dorylinae, ants famous for their predatory lifestyle and massive colonies. Unlike most ants that have permanent nests, army ants are nomadic. They establish temporary bivouacs (temporary nests made of living workers linked together) and move every few weeks as they deplete local food sources ^[1]. Their colonies can reach millions of workers, making them arguably the most impressive social structure in the ant kingdom. The queen is ergatoid, completely wingless and never leaves the nest. She is permanently housed inside the bivouac and produces eggs continuously once established ^[1]. Workers are polymorphic, with major workers (soldiers) having larger heads and mandibles for defense and processing large prey, while minor workers handle most foraging and brood care ^[1]. This species is found across central to southern Africa, with documented records from the DRC, Mozambique, and South Africa ^[1].

Housing Dorylus bequaerti

Housing Dorylus bequaerti presents one of the greatest challenges in antkeeping. These ants require enormous space, colonies with millions of workers need room to form large bivouacs and conduct raids. A typical setup would require multiple connected enclosures totaling several square feet of floor space. The nest area should allow workers to cluster together in a humid chamber, with access to a foraging area where raids can be conducted. Because they are nomadic, you must design the setup to allow colony relocation, this can be achieved by providing multiple potential nest sites and allowing the colony to choose. Escape prevention is absolutely critical, they will rapidly disperse and establish new bivouacs if any escape route exists. Use tight-fitting lids, seal all gaps, and consider using fluon on enclosure edges. Never house them in setups designed for typical ants, they will simply abandon small enclosures and decline. ^[1]

Feeding and Predation

Dorylus bequaerti are obligate predators. In the wild, they survive almost entirely by raiding other ant colonies, particularly those of other Dorylus species and various Myrmicinae. They will also capture other arthropods including termites, beetles, and caterpillars. Their raids are legendary, columns of thousands of workers sweep across the forest floor, overwhelming colonies many times larger than themselves through sheer numbers ^[1]. In captivity, you must provide a constant supply of live prey. This means maintaining cultures of feeder insects (crickets, mealworms, roaches) or, ideally, keeping target ant colonies as prey. Some keepers provide pre-killed insects, but live prey triggers the natural raiding behavior that keeps the colony active and healthy. Feed generously, a hungry army ant colony will become stressed and may consume its own brood. Sugar water is sometimes accepted but should never be a primary food source.

Temperature and Seasonal Care

As a tropical African species, Dorylus bequaerti requires warm temperatures year-round. Keep the nest area at 24-28°C with a slight gradient allowing workers to self-regulate. A heating cable or mat on one side of the enclosure can provide this gradient. They do not hibernate, but activity may decrease during cooler periods. In their native range, they experience seasonal variation in rainfall rather than temperature, with peak activity during wet seasons when prey is abundant. Maintain consistent humidity (60-80%) in the nest area, but ensure good ventilation to prevent mold. The foraging area can be slightly drier. Avoid temperature drops below 20°C as this can stress the colony and slow brood development. Monitor colony behavior, if workers become sluggish and cluster tightly, the temperature may be too low. ^[1]

The Challenge of Colony Establishment

Acquiring Dorylus bequaerti is exceptionally difficult. Unlike most ant species, they cannot be collected via nuptial flights because ergatoid queens never leave the nest to mate. Instead, reproduction occurs within the colony, and new colonies form when a group of workers with a queen breaks off (fission) or when a queen is adopted by a fragment colony. This means wild colonies cannot be sustainably harvested without destroying them. Most captive colonies available in the hobby are either collected as fragments with a queen or are acquired through specialized dealers who work with African suppliers. Expect to pay premium prices and wait for availability. When you do acquire a colony fragment, it may take months for the queen to begin laying eggs and for the colony to stabilize. Do not disturb the colony during this critical establishment period. ^[1]

References