What type of structure do carpenter ants commonly infest?

Carpenter ants are primarily known for their tendency to infest wooden structures. They do not eat wood in the way termites do, but they excavate it to create nests. This behavior is driven by their need for a safe place to establish their colonies, which typically occurs in damp or decaying wood, although they can also nest in sound wood. This is why wooden structures, including homes, decks, and trees, are particularly susceptible to carpenter ant infestations.

The other options do not match the behavior and habitat preferences of carpenter ants. Concrete walls do not provide the required nesting material for carpenter ants, soil is not where they establish nests, and fabric materials are not a suitable environment or nesting substrate for these insects. Understanding the behavior and preferred habitats of carpenter ants is vital for effective pest management and control.