Dorylus depilis

Dorylus depilis

Dorylus depilis is a species of army ant native to central Africa. Workers are small to medium-sized ants, typically measuring 3-7mm, with the characteristic army ant body plan: a distinct head, powerful mandibles, and a relatively small gaster. The coloration is generally reddish-brown to dark brown. This species is part of the Dorylus genus, commonly known as driver ants or army ants, famous for their massive swarming raids where thousands of workers coordinate to overwhelm prey. The species has been documented in the Democratic Republic of Congo and Zambia (Zambèze) ^[1][2].

Quick Summary

• Difficulty: Expert
• Origin & Habitat: Central Africa, Democratic Republic of Congo and Zambia. In the wild, these ants inhabit tropical forest environments where they maintain large nomadic colonies that bivouac (form temporary nests from their own bodies) rather than establishing permanent nests.
• Colony Type: Monogyne colonies with a single queen. Army ants typically have extremely large colonies numbering in the hundreds of thousands to millions of workers. The colony structure is highly organized with distinct worker castes of different sizes.
  • Colony: Monogyne
• Size & Growth:
  • Queen: Estimated 15-25mm based on genus Dorylus patterns, queens are among the largest in the ant world
  • Worker: 3-7mm ^[1], polymorphic with major and minor workers
  • Colony: Extremely large, Dorylus colonies can reach hundreds of thousands to millions of workers
  • Growth: Fast, army ant colonies grow rapidly when well-fed
  • Development: Estimated 4-6 weeks based on typical army ant development patterns (Development is temperature-dependent, warmer conditions accelerate growth. Army ant colonies produce brood in waves rather than continuously.)
• Antkeeping:
  • Temperature: Keep at 24-28°C, army ants are tropical and require warm, stable conditions. Use a heating cable on one side of the nest to create a gentle gradient.
  • Humidity: High humidity is essential, aim for 70-85%. Army ants naturally inhabit humid tropical forests. Keep the nest substrate consistently moist but not waterlogged.
  • Diapause: No, as a tropical species, Dorylus depilis does not require hibernation. Maintain warm conditions year-round.
  • Nesting: Army ants do not build traditional nests. In captivity, they form bivouacs using their own bodies and any available material. Provide a formicarium with multiple connected chambers and plenty of open space for the colony to organize. Darkened nesting areas help simulate their natural underground bivouac sites.
• Behavior: Extremely active and aggressive predators. Workers hunt in massive coordinated swarms called raids, overwhelming prey through sheer numbers. They have powerful mandibles and can deliver a painful bite. Escape prevention is critical, they will rapidly colonize any available space and are skilled at finding gaps in enclosures. This species is not suitable for beginners due to the specialized care requirements and colony size.
• Common Issues: Colony collapse from inadequate humidity, army ants quickly die in dry conditions, Escape due to their small size and determination, use excellent barrier methods like fluon, Difficulty providing sufficient prey, colonies require massive amounts of protein, Aggressive swarming behavior makes routine maintenance challenging, Bivouac formation can be disrupted by improper lighting, keep nesting areas dark

Housing and Nest Setup

Dorylus depilis requires specialized housing that accommodates their unique bivouac lifestyle. Unlike most ants that build permanent nests in soil or wood, army ants form temporary nests from their own bodies, clustering together in a living mass. In captivity, provide a large formicarium with multiple connected chambers filled with damp substrate (like soil or coco fiber) that the ants can manipulate. The enclosure should be spacious, army ant colonies grow massive and need room to organize their raids. Keep nesting areas dark by covering the formicarium with a dark cloth, as light disturbs their bivouac formation. The outworld (foraging area) should be separate from the nest and large enough to accommodate swarming raids.

Feeding and Diet

Army ants are obligate predators that require a constant supply of live prey. Dorylus depilis will accept a wide variety of arthropods including crickets, mealworms, roaches, and other insects. Feed generously, a mature colony may consume thousands of prey items per week. Prey should be appropriately sized to the worker caste, provide a mix of sizes since polymorphic workers can handle different prey. Some colonies may accept protein jelly or frozen insects, but live prey is ideal for stimulating natural hunting behavior. Sugar sources are generally not required for army ants as they get their carbohydrates from the hemolymph of prey.

Temperature and Humidity Control

Maintain temperatures between 24-28°C using a heating cable placed on one side of the nest to create a thermal gradient. Army ants are tropical and cannot tolerate cool conditions. Temperature affects development speed, warmer temperatures within this range accelerate growth but also shorten lifespan. Humidity is critical: keep substrate consistently moist at 70-85% relative humidity. Mist the nest regularly and ensure water reservoirs are available. Poor humidity quickly leads to colony death. Use a digital hygrometer to monitor conditions. Avoid placing the formicarium near air conditioning or heating vents that cause fluctuations.

Colony Dynamics and Raiding Behavior

Dorylus depilis exhibits the characteristic army ant raiding behavior where columns of workers fan out to overwhelm prey. This swarming behavior is spectacular but can be overwhelming in captivity, the entire colony becomes highly active during raids. The colony has a nomadic phase where they regularly move their bivouac site, followed by a stationary phase. In captivity, you can simulate this by occasionally disturbing the bivouac to encourage movement to new areas. Queens are permanently engaged in egg-laying, producing thousands of eggs daily during peak periods. Brood development occurs in waves rather than continuously.

Safety and Escape Prevention

Army ants are among the most difficult ants to contain. Their small size allows them to squeeze through tiny gaps, and their aggressive foraging drive makes them persistent escape artists. Use multiple barrier methods: apply fluon or petroleum jelly to all rim edges, ensure lids fit tightly with no gaps, and consider double-enclosure systems. Inspect all tubing connections and any gaps in acrylic seams. Never open the formicarium in a room where they could escape, have a catch container ready. Their bite is painful due to powerful mandibles, though they are not medically significant. Handle with care and avoid allowing them to walk on skin.

Frequently Asked Questions

References