Bothroponera cambouei

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Endemic to Madagascar, found throughout the island from north to south in mesic forests at various elevations from sea level to over 1200m, including littoral and transitional forest habitats ^[1][3][4].
• Colony Type: Colonies have one queen (monogyne). The species has both winged queens and ergatoid (wingless) queens, with ergatoids having ocelli and incomplete thoracic sclerites, these likely serve as replacement reproductives if the primary queen dies ^[1].
• Size & Growth:
  • Queen: Approximately 10.7mm total length (inferred from worker size, exact queen measurements unavailable) ^[2]
  • Worker: Approximately 10.7mm total length ^[2]
  • Colony: Colony size data is limited. Collection samples show dozens to over 200 workers, but maximum colony size is unconfirmed ^[4][1].
  • Growth: Growth rate is unconfirmed for this species
  • Development: Development time is unconfirmed for this species (Ponerine ants typically develop slower than common Myrmicinae, but specific development timeline for B. cambouei is not documented.)
• Antkeeping:
  • Temperature: Keep at 22-26°C. This species is found in tropical Madagascar at various elevations, so a moderate temperature range works well. A slight gradient allows workers to self-regulate ^[1].
  • Humidity: Moderate to high, they inhabit mesic forests and nest in rotting wood and soil. Keep nest substrate moist but not waterlogged, with some drier areas available. Think damp forest floor conditions ^[1].
  • Diapause: No, as a tropical species from Madagascar, they do not require hibernation. Keep temperatures stable year-round.
  • Nesting: They naturally nest in rotten logs, under stones, in the ground, and in root mat layers ^[1]. In captivity, a naturalistic setup with soil or soil-like substrate in a formicarium works well, or a Y-tong/plaster nest with moist substrate. Provide nesting chambers scaled to their medium size.
• Behavior: Workers are generally calm and not overly aggressive, but they will sting if threatened. Their most notable behavior is thanatosis, playing dead when disturbed, which serves as a passive defense ^[1]. They are foragers through leaf litter rather than active hunters. Escape risk is moderate, they are medium-sized ants but not particularly agile climbers. Standard barrier methods should suffice. As Ponerinae, they have a functional stinger with venom containing defensive pyrrolidine alkaloids ^[2].
• Common Issues: queen loss during founding, ergatoid presence suggests replacement system exists, but founding queens are vulnerable to disturbance, thanatosis can make it appear workers are dead when they're actually just playing dead, don't discard seemingly dead colonies, slow development compared to common ants may lead keepers to overfeed or disturb the nest unnecessarily, medium size means they can escape through standard formicarium openings if barriers aren't applied, tropical species will not survive cool temperatures, keep above 20°C year-round, this species is listed as exotic in some regions, check local regulations before keeping

Housing and Nest Preferences

Bothroponera cambouei naturally nests in rotting logs, under stones, in the ground, and in root mat layers ^[1]. They are primarily terrestrial but some specimens have been found foraging on low vegetation, so they can use vertical space when available. For captive care, a naturalistic setup with a soil or soil-like substrate works best, this allows them to create their own chambers like they would in rotting wood or soil. A Y-tong or plaster nest with moist chambers is also suitable. Provide multiple chambers of varying sizes since this species shows significant size variation between workers. The nest should be kept humid but with good ventilation to prevent mold. Because they play dead when disturbed, avoid frequent nest disturbances once the colony is established.

Feeding and Diet

In the wild, these ants forage through leaf litter, searching for small invertebrates and likely honeydew from aphids ^[1]. As Ponerinae, they are predatory on small arthropods. In captivity, offer a varied diet: small live prey like fruit flies, pinhead crickets, or mealworms (appropriately sized), along with sugar sources like honey water or sugar water. They are not extreme specialists like some ponerines, so a standard ant diet works well. Feed protein prey 2-3 times per week and keep sugar water available constantly. Remove uneaten prey after 24-48 hours to prevent mold. Their moderate size means they can tackle prey items comparable to their own body size.

Temperature and Seasonal Care

As a tropical species endemic to Madagascar, Bothroponera cambouei does not require hibernation or diapause. Keep temperatures in the 22-26°C range year-round. They are found at various elevations from 25m to over 1200m in Madagascar, suggesting they can adapt to a range of conditions, but they do best with stable warmth ^[3][4]. Avoid temperatures below 20°C as this could stress or kill the colony. Room temperature within this range is typically suitable. If your room is cooler, use a heating cable on one side of the nest to create a gentle gradient, place it on top of the nest to avoid drying out the substrate too quickly. No seasonal changes in care are needed beyond maintaining stable temperatures.

Behavior and Defense

The most distinctive behavioral trait of this species is thanatosis, when disturbed, workers play dead by curling up and remaining motionless ^[1]. This is a passive defensive strategy that makes them appear unappetizing to predators. If you see your ants suddenly go limp, do not assume they are dead, give them time to recover. Additionally, as Ponerinae, they have a functional stinger and can deliver painful stings. Their venom contains 2,5-disubstituted pyrrolidine alkaloids, which serve as a chemical defense ^[2]. In captivity, they are generally calm and will not act aggressively unless the nest is threatened. They are moderate foragers rather than aggressive hunters, moving through leaf litter to find prey. Escape risk is moderate, they are not particularly small or agile, so standard barriers work well.

Colony Structure and Reproduction

Bothroponera cambouei is monogyne, meaning colonies have a single queen. However, the species also has ergatoid (wingless) queens alongside the typical winged queens ^[1]. Ergatoid queens have ocelli (simple eyes) and incomplete thoracic sclerites, making them look very similar to workers but with queen-specific features. These ergatoids likely serve as replacement reproductives, if the primary queen dies, an ergatoid can take over egg-laying duties. This makes the colony more resilient to queen loss. Colony size appears moderate, collection data shows dozens to over 200 workers in samples, though maximum colony size is unconfirmed ^[4]. The species shows remarkable morphological variation with seven different forms identified, some of which occur together in the same areas ^[1].

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References