Which type of ant tends to nest in wall voids?

Pharaoh ants are known for their habit of nesting in wall voids and other hidden spaces within buildings. They prefer warm, humid environments, which makes wall voids a suitable location for their colonies. This nesting behavior is significant because it allows them to remain hidden while also providing access to food sources that may be present within the structure. Pharaoh ants are small, light yellow to reddish-brown in color, and are often found in kitchens and other areas where food is accessible.

In contrast, fire ants typically build mounds in open areas outside and do not usually nest within the walls of structures. Carpenter ants also prefer wood and may excavate it to create nests, but they are more commonly associated with wooden structures rather than nestling specifically within wall voids. Little black ants, while they can invade structures, generally nest in soil, under rocks, or in other outdoor areas rather than in hidden indoor locations. This helps underline the specific nesting preference of Pharaoh ants, making them distinct in the context of the question.