Carpenter ant
Carpenter ants (Camponotus spp.) are large (0.3 to 1.0 in or 0.76 to 2.54 cm) ants indigenous to many forested parts of the world.[2]
They build nests inside wood consisting of galleries chewed out with their mandibles, preferably in dead, damp wood. However, unlike termites, they do not consume wood,[3] discarding a material that resembles sawdust. Sometimes, carpenter ants hollow out sections of trees. They also commonly infest wooden buildings and structures, and are a widespread nuisance and major cause of structural damage. Nevertheless, their ability to excavate wood helps in forest decomposition. The genus includes over 1,000 species.[4] They also farm aphids. In the farming, the ants protect the aphids while they excrete a sugary fluid called honeydew, which the ants get by stroking the aphids with their antennae.
Carpenter ant species reside both outdoors and indoors in moist, decaying, or hollow wood, most commonly in forest environments. They cut “galleries” into the wood grain to provide passageways to allow for movement between different sections of the nest. Certain parts of a house, such as around and under windows, roof eaves, decks and porches, are more likely to be infested by carpenter ants because these areas are most vulnerable to moisture.[citation needed]
Carpenter ants carrying a dead bee
Carpenter ants have been known to construct extensive underground tunneling systems. These systems often lead to an end at some food source – often aphid colonies, where the ants extract and feed on honeydew. These tunneling systems also often exist in trees. The colonies typically include a central “parent” colony surrounded and supplemented by smaller satellite colonies.[5]
Carpenter ants are considered both predators and scavengers. These ants are foragers that typically eat parts of other dead insects or substances derived from other insects. Common foods for them include insect parts, “honeydew” produced by aphids, or extrafloral nectar from plants. They are also known for eating other sugary liquids such as honey, syrup, or juices. Carpenter ants can increase the survivability of aphids when they tend them. They tend many aphid species but can also express preference for specific ones.[citation needed]
Most species of carpenter ants forage at night. When foraging, they usually collect and consume dead insects. Some species less commonly collect live insects. When they discover a dead insect, workers surround it and extract its bodily fluids to be carried back to the nest. The remaining chitin-based shell is left behind. Occasionally, the ants bring the chitinous head of the insect back to the nest, where they also extract its inner tissue.[6] The ants can forage individually or in small or large groups, though they often opt to do so individually. Different colonies in close proximity may have overlapping foraging regions, although they typically do not assist each other in foraging. Their main food sources normally include proteins and carbohydrates.[7] Instances of carpenter ants bleeding Chinese elm trees for the sap have been observed in the northern Arizona region. These instances may be rare as the colonies vastly exceeded the standard size of carpenter ant colonies elsewhere.[8] When workers find food sources, they communicate this information to the rest of the nest. They use biochemical pheromones to mark the shortest path that can be taken from the nest to the source. When a sizable number of workers follows this trail, the strength of the cue increases and a foraging trail is established. This ends when the food source is depleted. The workers will then feed the queen and the larvae by consuming the food they have found, and regurgitating (trophallaxis) the food at the nest. Foraging trails can either be under or above ground.[9]
