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Thief Ants

Overview of Thief Ants

Thief ants are among the smallest household ant species, measuring just 1.5–2.2 mm in length. Their pale yellowish to light or dark brown color, unevenly rounded shape, and lack of spines on the thorax make them distinct. Thief ants are found throughout most of the United States.

Identification

  • Color: Pale yellowish to light or dark brown
  • Legs: Six
  • Shape: Unevenly rounded; thorax lacks spines
  • Size:5–2.2 mm long (one of the smallest household ant species)
  • Antennae: Yes
  • Region: Found throughout most of the United States

Environment

  • Indoor Habits:
    Thief ants nest in small crevices, woodwork, and masonry. They often enter structures during hot weather in search of food, using wall voids and wires to travel from room to room.
  • Outdoor Habits:
    Thief ants build nests in exposed soil, under objects, in trash, rotten wood, and cavities in trees.

Threats

Thief ants pose several risks:

  • They may carry disease-inducing organisms to human food, as they are known to feed on dead rats and mice.
  • Thief ants can serve as intermediate hosts for the poultry tapeworm, which poses a threat to livestock.

Treatment

Effective control of thief ants requires locating their nests, which can be challenging. To prevent an infestation:

  • Work with a licensed pest professional to develop and implement a preventative pest management plan.
  • Address potential entry points and nesting areas promptly.