Colobopsis leonardi

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Native to Southeast Asia including Borneo, India, Indonesia, Laos, Malaysia, Myanmar, Philippines, Singapore, Thailand, and southern China. Found in tropical rainforests and arboreal habitats in tree canopies ^[2][7].
• Colony Type: Large polydomous colonies with multiple nest entrances. Colonies maintain nests along fallen branches or tree sections, with workers moving freely between nest sites ^[1].
• Size & Growth:
  • Queen: size data unavailable
  • Worker: 6.23-10.96mm total length ^[1]
  • Colony: Large colonies, dominant canopy species forming extensive colonies ^[2]
  • Growth: Moderate
  • Development: Estimated 6-8 weeks based on related Camponotus species at tropical temperatures (Development likely faster at warmer temperatures typical of their tropical habitat)
• Antkeeping:
  • Temperature: Keep at 24-28°C. Being a tropical species, they need warm conditions. A heating cable on one side of the nest creates a suitable gradient ^[2].
  • Humidity: Moderate to high humidity (60-80%). As an arboreal species from rainforest habitats, they prefer damp conditions but not waterlogged. Provide a water tube for drinking water.
  • Diapause: No, being a tropical species, they do not require hibernation. Keep temperatures stable year-round.
  • Nesting: Arboreal setup works best, they naturally nest in tree branches and hollow twigs. Use a Y-tong (AAC) nest or a naturalistic setup with cork or wooden branches. Provide vertical space and multiple small chambers. Test tubes can work for founding colonies but will need to transition to more arboreal-style housing as the colony grows.
• Behavior: These ants are diurnal and primarily arboreal. Workers forage actively on defined trails, hunting prey including termites and other small insects ^[1]. They are predatory and will take down a variety of arthropods. Major workers have phragmotic (plugging) head morphology used to block nest entrances. Minor workers can exhibit exploding defense when threatened, they rupture their gaster to release toxic secretions ^[2]. Escape risk is moderate, use standard barrier methods. They are not aggressive toward keepers but will defend their nest.
• Common Issues: tropical temperature requirements mean colonies can struggle in cool rooms or air conditioning, arboreal nesting needs mean they may not thrive in standard horizontal test tube setups long-term, predatory diet requires consistent protein feeding, sugar alone is insufficient, wild-caught colonies may carry zombie ant fungus (Ophiocordyceps) which can affect colony health, large colony size requires expansion space, cramped colonies may decline

Housing and Nest Setup

Colobopsis leonardi is an arboreal species that naturally nests in tree branches, hollow twigs, and similar elevated locations. In captivity, they do best in setups that mimic their natural arboreal habitat. A Y-tong (AAC) nest with narrow chambers works well, or you can create a naturalistic setup using cork or wooden branches. The key is providing vertical space and multiple small chambers rather than large open areas. For founding colonies, a test tube setup can work initially, but plan to transfer to a more arboreal-style formicarium as the colony grows beyond 20-30 workers. These ants rarely descend to the ground in the wild ^[8], so they appreciate having their nest elevated when possible. Ensure the nest has some humidity control, these rainforest ants need moisture but not standing water.

Feeding and Diet

Unlike many carpenter ants that rely heavily on honeydew and sugar, C. leonardi is actively predatory and needs protein-rich food. Research in Thailand showed they accept diverse prey including termites (Macrotermes, Coptotermes, Nasutitermes), other ants, beetles, woodlice, and even earthworm pieces ^[1]. They hunt individually, carrying prey back to the nest head-first for small items. Feed them small live insects like fruit flies, pinhead crickets, or mealworm pieces. They will also accept protein-based commercial ant foods. Sugar water or honey should be offered as a supplement, but protein is the primary dietary need. Feed protein 2-3 times per week, and keep sugar sources available constantly. Remove uneaten prey after 24-48 hours to prevent mold.

Temperature and Climate

Being a tropical species from Southeast Asian rainforests, C. leonardi requires warm temperatures year-round. Keep the nest area at 24-28°C (75-82°F). A small heating cable placed on one side of the nest creates a temperature gradient that allows the ants to regulate their own conditions. Avoid temperatures below 22°C as this can slow colony development and make them sluggish. Room temperature in most homes should be sufficient, but watch out for air conditioning or drafty windows in winter. Unlike temperate species, they do not require any diapause or winter cooling period, maintain consistent tropical conditions throughout the year. The research on zombie ant behavior shows they are adapted to warm, humid rainforest conditions with temperature influencing fungal manipulation timing ^[9].

Defense Mechanisms

The most remarkable trait of C. leonardi is its membership in the 'exploding ant' group (Colobopsis cylindrica group). When threatened, minor workers can flex their gasters so forcefully that they rupture, releasing a toxic chemical mixture that they then smear onto attackers ^[2]. This suicidal defense is called autothysis. Major workers have a different defensive strategy, their heads are modified with a phragmotic shape that allows them to physically plug nest entrances, blocking intruders. In captivity, you may rarely observe the exploding defense as it requires significant threat. However, when cleaning the nest or moving colonies, handle gently to avoid triggering this response. The toxic secretions are primarily a defense against predators and rival colonies in the wild.

Colony Structure and Growth

C. leonardi forms large polydomous colonies, meaning they maintain multiple nest sites connected by trails. Research found colonies with nest entrances distributed along fallen branches over 5 meters long ^[1]. Workers move freely between nest sites, and the colony shows clear foraging trails. This social structure means they can support multiple egg-laying queens. Colony growth is moderate, expect 6-10 weeks from egg to first worker (nanitics) at optimal temperatures. Once established, colonies can grow quite large given their dominant canopy status. The workers show continuous variation from minor to major morphs, with larger workers developing more pronounced features ^[10]. Be patient with founding colonies, the first few months are slow as the queen raises her initial brood.

Health Concerns

One important consideration for C. leonardi is their susceptibility to the zombie ant fungus Ophiocordyceps camponoti-leonardi. This specialized fungal parasite is known from Thailand and manipulates infected ants to leave the canopy, descend to understory vegetation, and bite into leaf veins before dying ^[8][4]. The fungus then grows from the ant's head to release spores. While this is primarily a concern for wild colonies in their native range, newly collected wild colonies could potentially carry the fungus. If you notice workers acting strangely (disoriented, climbing excessively, biting enclosure surfaces), this could indicate fungal infection. Maintain clean conditions and avoid introducing soil or plant material from their native range. Otherwise, with proper care (warm temperatures, adequate protein, appropriate humidity), they are relatively hardy in captivity.

Frequently Asked Questions

Report an Issue

The current care sheet is based fully on literature. See inconsistencies, or something that's incorrect? Please report here, it will be resolved after review from an admin. Contributing to the blogs tab also helps providing information, to make us be able to further improve the caresheets. Thank you for your support!

References