Carpenter Ants

Facts, Identification & Control

Latin Name

Camponotus spp.

Appearance

carpenter ant illustration

  • Length: Carpenter ants are among the largest ants in the United States, ranging from 3.4 to 13 mm long. More size information.
  • Color: The most common color is black, but some species have reddish or yellowish coloration. The color also varies among species, ranging from jet-black to dark brown, red, black, yellow, orange, yellowish tan or light brown. Some ants exhibit both red and black coloration.
  • Mandibles: Workers have large mandibles.

Read more about carpenter ant identification.

Behavior, Diet & Habits

Carpenter ants reside both outdoors and indoors in moist, decaying or hollow wood.

Galleries & Nests
Ants of the genus Camponotus are known as carpenter ants because they prefer to establish their colonies in galleries excavated from damp or damaged wood. They cut galleries into the wood grain to form their nests and provide passageways for movement from section to section of the nest. This activity produces wood shavings mixed with parts of dead ants which provides clues to nesting locations.

Carpenter ants clean their nesting sites, and their galleries are not lined with mud or moist soil as termite galleries typically are. The workers keep their galleries as smooth as sandpapered wood.

Attracted to Moisture
In natural environments, carpenter ants dwell in both dead and living trees, stumps and rotting logs. However, they may also establish their nests inside of homes and buildings where wood is found, especially where wood has been exposed to severe moisture.

Colonies
Carpenter ants build two types of nests: parent colonies and satellite colonies. Parent colonies consist of a queen, her brood and workers. Satellite colonies consist of workers, older larvae and pupae. Workers create satellite colonies when the parent colony lacks sufficient space or when there is a suitable supply of food or water. There may be several satellite colonies associated with a parent colony.

Food
Carpenter ants do not eat wood as termites do, but instead remove wood and deposit the debris outside of their nests in small piles.

They will feed on a variety of food people eat—particularly sweets and meats. They will also feed on other insects.

Reproduction

Queens lays 9 to 16 eggs the first year and may live up to 25 years. Eggs complete their life cycle in about 6 to 12 weeks.

Signs of a Carpenter Ant Infestation

red carpenter ant image
Workers and swarmers (winged ants) are the most likely sign homeowners observe. 

  • Workers: The workers may be observed foraging for food. 
  • Swarmers: Swarmers usually are produced when a colony matures and is ready to form new colonies. These winged individuals often indicate a well-established colony.
  • Debris: An additional sign of activity is the debris they produce from tunneling in the wood. Rough wood shavings mixed with parts of dead ants from the colony indicate nesting activity.
  • Sound: A final sign may be the “rustling” sound sometimes heard as the ants go about their activity in the home’s wood.

Carpenter Ant Treatment

In controlling an infestation of carpenter ants, it is necessary to first find the nest. Once found, it can be removed or treated chemically. All moisture conditions that the ants found conducive must be corrected.

If treated early, serious structural damage to houses and buildings can be avoided. However, these ants could cause extreme damage if they continue undiscovered for an extended period. Thus, it is best to contact a pest control professional in the event of an infestation.

It is advisable to seek professional help in getting rid of carpenter ants and containing infestations, as incorrect procedures may allow the colony to rebound when surviving members resume their burrowing and foraging.

More Information

Carpenter Ant Identification: How to Identify a Carpenter Ant

What Does a Carpenter Ant Look Like?

Carpenter Ant Size

Life Cycle of Carpenter Ants

Carpenter Ant Larvae

Carpenter Ant Queens

Finding Carpenter Ant Nests

Carpenter Ant Infestation

Carpenter Ant Bites

Natural Carpenter Ant Pesticide

Red and Black Carpenter Ants

Boric Acid and Carpenter Ants

Carpenter Ants in Canada