Carpenter Ants

Carpenter Ant Workers

Carpenter Ant Workers
  • Size: About 6 to 13 mm long
  • Color: Generally black, sometimes with reddish hues
  • Appearance: Robust body, strong jaws, wingless
  • Attraction: Moist or rotten wood to establish nests, food sources like sugar, proteins, and fats
  • Detection Element: Scratching noises in wood structures, small piles of sawdust, damage to wood

Carpenter ant workers are distinguished by several physical and behavioral characteristics. Typically, these ants measure between 6 and 13 mm in length, although size can vary slightly depending on the species. They display a primarily black color, but some may show shades of red or brown. Their body is segmented into three distinct parts: the head, thorax, and abdomen, with a narrow waist between the thorax and abdomen, characteristic of Hymenoptera.

The antennae of carpenter ants are elbowed, a distinctive trait of ants in general. In terms of morphology, polymorphism is often observed within the colony, with workers varying in size. Adult carpenter ants possess powerful mandibles, used mainly for chewing wood, although they do not consume wood, unlike termites.

These insects are mostly active at night. Their diet is omnivorous, including sweet substances, insects, and sometimes even human food debris. Carpenter ants are not naturally aggressive, but they can bite if they feel threatened, using their robust mandibles for defense.

Their preferred habitat is moist or rotten wood, which often leads them to establish their nests in wooden structures, such as houses. Signs of a carpenter ant infestation include the presence of fine sawdust around wood structures and frequent observation of wandering ants, especially at night. Effective management of these ants often requires the intervention of a pest control professional, particularly in cases of significant infestation.

Carpenter Ant Alates

Carpenter Ant with Wings
  • Size: Up to 18 mm long for females, slightly smaller for males
  • Color: Black or dark brown
  • Appearance: Wings present, larger than workers, slender body
  • Attraction: Light during the breeding season to find partners and nesting sites
  • Significance: The presence of winged carpenter ants indicates an established nest (2 years and older)

In the alate stage, carpenter ants are distinctly different from their usual worker form. This phase of their life cycle is marked by the appearance of two pairs of wings – a larger anterior pair and a smaller posterior pair. These wings are generally transparent, sometimes with a slight tint. In terms of size, alates often surpass workers, with males and future winged queens reaching up to 18 mm in length. Their color remains primarily black, similar to workers, though some shades of red or brown may be present. This distinctive appearance helps differentiate alates from other colony members and other insect species.

Behavior of Alates

The behavior of alates is heavily focused on reproduction and the dissemination of the species. Their life cycle enters an active phase, typically in spring or early summer, where they leave the nest en masse in a process known as swarming. This swarming is triggered by specific weather conditions, often a combination of rain followed by warmth and humidity. The mating flight is their primary mission, during which males and females mate, sometimes in mid-air or shortly after landing. After mating, the fertilized females seek suitable locations to establish new colonies and become the queens of new colonies. Unlike females, males generally die shortly after mating.

Importance of the Alate Stage

The presence of winged carpenter ants, especially inside homes, is often an indicator of an infestation. These insects, attracted to light, frequently attempt to escape outdoors, thereby revealing the existence of a nearby nest. Effective management of this phase is crucial in the fight against carpenter ants. Understanding their reproductive cycle and dissemination helps develop preventive and curative strategies to control the ant population and prevent the establishment of new colonies. In most cases, the presence of alates may require professional intervention for proper assessment and treatment.

Carpenter Ant Queen

Carpenter Ant Queen
  • Size: Can reach up to 20 mm long
  • Color: Black or dark brown
  • Appearance: Larger than all other ants in the colony, wings present initially but lost after mating
  • Attraction: Suitable places to establish a new colony, often in moist wood
  • Detection Element: Difficult to observe as she typically remains hidden in the nest, presence indicated by a large number of workers and increased activity

The queen of the carpenter ant plays a central role in the colony, being the sole member capable of laying eggs. After completing her mating flight and mating with a male, the queen loses her wings and dedicates herself to founding a new nest. This process usually begins with the search for a suitable location, often moist or rotten wood, conducive to nest construction. Once established, the queen begins laying eggs that will give birth to the first workers.

The queen is larger than other colony members, a feature that helps identify her. Her longevity is remarkable, often living several years, and even up to a decade in some cases. Throughout her life, she is the primary egg producer of the colony, thus regulating the size and dynamics of the population. The workers, in turn, take care of feeding and protecting the queen, as well as caring for the young and maintaining the nest.

The health and survival of the queen are crucial for the colony’s continuity. If the queen dies without leaving a successor, the colony cannot survive long, as no other ant is capable of taking her place for reproduction. That’s why measures to combat carpenter ant infestations often target the queen and the nest, to effectively eradicate the colony.

Distinguishing Carpenter Ants from Other Insects

Little Black Ants

Little Black Ants

Carpenter ants differ from little black ants primarily in size. While carpenter ants can measure up to 13 mm, little black ants are much smaller, typically around 1.5 to 2 mm. Additionally, little black ants form very visible trails and prefer sugary food sources, whereas carpenter ants are often more isolated and feed on a variety of foods. In terms of habitat, little black ants often establish their nests under rocks or in cracks in sidewalks, unlike carpenter ants that prefer moist wood.

Pharaoh Ants

Pharaoh Ants

Pharaoh ants are significantly smaller than carpenter ants, measuring about 2 mm. They are characterized by a light yellow or brownish coloration, unlike the primarily black hue of carpenter ants. Pharaoh ants are known for their ability to establish themselves in indoor environments, including hospitals and residential buildings, where they can become a major problem. They require warm and humid conditions to survive, often establishing themselves near heat sources.

Pavement Ants

Pavement Ants

Pavement ants, although similar in color to carpenter ants, are much smaller, measuring about 2.5 to 4 mm long. This species is known for its tendency to build nests under paving stones, slabs, and in the cracks of foundation walls. In terms of behavior, pavement ants are more aggressive than carpenter ants, often ready to bite when disturbed.



Earwigs, easily recognizable by their prominent pincers at the end of the abdomen, differ greatly from carpenter ants. They typically measure between 12 and 24 mm, thus falling within a similar size range, but their appearance is distinctly different. Earwigs prefer moist environments and are often found under stones, in rotten wood, or among plant debris. They primarily feed on plant material and dead insects, unlike carpenter ants which have a more varied diet and are not known to cause significant damage to plants.

Contact Us


Appel Gestion Parasitaire du Québec - Exterminateur Certifié au 1-450-558-5643


Appel Gestion Parasitaire du Québec - Exterminateur Certifié au 1-819-821-0553


Appel Gestion Parasitaire du Québec - Exterminateur Certifié au 1-514-970-5643

Toll Free

Appel Gestion Parasitaire du Québec - Exterminateur Certifié au 1-844-714-5643

Email Us

Soumission par courriel pour Gestion Parasitaire du Québec - Exterminateur Certifié
Logo Gestion Parasitaire du Québec
© 2024 Gestion Parasitaire du Québec