Argentine ant colonies can grow to monumental size. A single colony can contain several hundred thousand workers, with the colony borders sometimes covering entire habitats. Worker Argentine ants are about ¹⁄₁₆ of an inch long. Queen argentine ants are ¹⁄₈ of an inch to ¼ of an inch long.
Argentine ants prefer to eat sweets such as honeydew, but they will eat almost anything including meats, eggs, oils and fats. Their colonies are usually found in wet environments near a food source. Outdoors, they usually build shallow nests under boards or stones, beneath plants or alongside sidewalks. When conditions in their natural environment are either too wet or too dry, Argentine ants may seek shelter indoors, where they often nest near water pipes, sinks or potted plants.
Argentine ants do not pose a health threat, but they can contaminate food and should be avoided.