Camponotus laevissimus

Camponotus laevissimus - "Hairy Smooth Carpenter Ant"

Camponotus laevissimus is a large, glossy black carpenter ant native to western North America. Workers are entirely shiny black with distinctive short, bristly setae on their antennae, a key identification feature that separates them from similar species. Major workers reach 2.82-3.66mm head width, while minors are smaller at 1.68-2.32mm. This is a high-elevation species typically found between 2000-2500 meters in ponderosa pine forests, oak woodlands, and mixed coniferous habitats across Canada, the United States, and Mexico ^[1].

What makes this species interesting is its nesting behavior, it excavates colonies in rotting logs and stumps, including relatively fresh-cut pine wood. Workers coordinate in teams: some excavate wood fragments and carry them to the entrance, while others transport the debris away from the nest site. They form large colonies and are primarily diurnal foragers, though they can also be active at night ^[1]. This species was only recently distinguished from the similar C. laevigatus in 2019,so most historical literature actually refers to C. laevissimus.

Quick Summary

• Difficulty: Medium
• Origin & Habitat: Western North America (Canada, USA, Mexico), high elevation forests at 2000-2500m, ranging up to 3667m. Found in ponderosa pine forests, oak forests, mixed pine/deciduous forests, and pinyon juniper woodlands. Nests in rotten logs and stumps, including recently cut wood ^[1].
• Colony Type: Likely single-queen (monogyne) colonies based on typical Camponotus patterns. Forms large colonies, one Washington nest had ~1000 workers, with colonies potentially reaching 10,000-20,000 workers ^[1].
  • Colony: Monogyne
  • Founding: Claustral
• Size & Growth:
  • Queen: Queens measure approximately 14-16mm total length (estimated from genus patterns)
  • Worker: Major workers: 2.82-3.66mm HW, Minor workers: 1.68-2.32mm HW ^[1]
  • Colony: Large colonies, estimated 1,000-20,000 workers ^[1]
  • Growth: Moderate, typical for large carpenter ants
  • Development: 6-10 weeks (estimated from Camponotus genus patterns at optimal temperature) (Development time is typical for the genus, faster in warmer conditions, slower when cooler. First workers (nanitics) are smaller than normal majors.)
• Antkeeping:
  • Temperature: Keep around 20-24°C. This is a cool-adapted mountain species that naturally experiences cooler temperatures at high elevations. Avoid overheating, room temperature is often ideal. A slight temperature gradient allows workers to self-regulate ^[1].
  • Humidity: Moderate humidity (50-60%). These forest-dwelling ants prefer damp but not waterlogged conditions. Keep nest substrate slightly moist and provide a water source. They do well with typical formicarium humidity levels.
  • Diapause: Yes, as a high-elevation species, they require a winter rest period. Reduce temperature to 10-15°C for 3-4 months (November-February in the Northern Hemisphere). This mimics their natural cold-season dormancy.
  • Nesting: Naturalistic setups work best, they excavate in rotting wood. In captivity, Y-tong nests or plaster nests with wood inserts simulate their natural environment. They can also adapt to acrylic nests but may benefit from adding wood or bark fragments. Avoid completely artificial setups without some wood material.
• Behavior: Generally calm and non-aggressive for a carpenter ant. Workers are active foragers, primarily diurnal but can be nocturnal. They do not use regular foraging trails like some species. Medium escape risk, use standard barrier methods. While they can bite, they rarely do so and their mandibles are too small to penetrate human skin effectively. They are not considered dangerous to humans ^[1].
• Common Issues: high elevation cold-adapted species may struggle in warm homes without temperature control, colonies grow large quickly, ensure you have space for a 10,000+ worker colony, excavating behavior can damage acrylic nests, naturalistic or Y-tong preferred, winter hibernation is required, plan for 3-4 months of reduced activity, wild-caught colonies may carry parasites (Microdon fly larvae, parasitic wasps)

Nest Preferences and Housing

Camponotus laevissimus naturally nests in rotting logs and stumps, including relatively fresh-cut pine wood. In the wild, they excavate chambers within the wood, creating tunnel systems that house the colony. They can even colonize stumps that were cut within the past year, workers excavate small pieces of wood and carry them out to create space ^[1].

For captive care, naturalistic setups work best. Y-tong (acrylic) nests with added wood fragments or bark allow them to exhibit natural excavation behavior. Plaster nests with a wood insert also simulate their preferred environment. Pure acrylic nests are usable but may be damaged by their excavating behavior. Test tubes can work for founding colonies but will need upgrading as the colony grows.

The key is providing damp wood material they can work with. A humidity reservoir connected to a wood chamber helps maintain appropriate conditions. These ants do best with moderate humidity (around 50-60%) and should have access to both moist and slightly drier areas within the nest.

Feeding and Diet

Like other carpenter ants, C. laevissimus is an omnivore with a preference for protein. In nature, they are predators of the western spruce budworm and other small insects ^[1]. They also consume honeydew from aphids and extrafloral nectar, though they do not visit the barrel cactus nectaries ^[1].

In captivity, offer a varied diet: protein sources like mealworms, small crickets, and other feeder insects 2-3 times per week. Sugar water or honey should be available constantly, carpenter ants need carbohydrates for energy. They are active foragers, so place food where workers can easily find it.

These ants have broad sensory detection and can recognize cuticular hydrocarbons from both nestmates and non-nestmates ^[1]. This means they may be selective about food acceptance, but they typically accept standard ant foods readily. Remove uneaten prey after 24-48 hours to prevent mold.

Temperature and Seasonal Care

This is a cold-adapted mountain species. In the wild, they live at elevations of 2000-2500 meters where temperatures remain cool year-round. They can tolerate temperatures from roughly 15°C up to about 28°C, but thrive in the 20-24°C range. Room temperature is often ideal for this species.

Avoid placing their nest near heat sources or in warm rooms. Overheating can stress colonies and may increase mortality. If your home runs warm, provide a cooler area within the setup or use a small fan for air movement.

Winter diapause is required. Reduce temperatures to 10-15°C for 3-4 months during winter (typically November through February in the Northern Hemisphere). This mimics their natural seasonal cycle and is essential for colony health. Do not feed during hibernation and keep water available but minimal. ^[1]

Behavior and Colony Dynamics

Camponotus laevissimus is primarily diurnal but can be active at night, especially in warmer conditions ^[2]. Workers forage individually rather than along established trails, they search for food actively throughout their territory. This makes them entertaining to watch as they explore the outworld.

Colonies can become quite large. One documented nest in Washington state contained approximately 1,000 workers, and researchers estimate mature colonies may reach 10,000-20,000 workers ^[1]. This growth potential means you should plan for a spacious setup if keeping this species long-term.

Workers are relatively docile and rarely show aggression toward keepers. While they can bite, their mandibles are small and unlikely to break human skin. They pose no real danger to humans. Escape risk is moderate, standard barrier methods like fluon on container rims work well.

Frequently Asked Questions

References