Their body is brown to black, and are approximately 1/16 – 1/8 inch in length. Their antennae have 12 segments and are without a club.
Outdoors, these ants usually live under rocks, in cracks in pavement, or larger ant nests. Indoors, they may invade walls and insulation but usually prefer to be near a heat source. Most colonies house several queens, and the workers range between 100 to 10,000. They are not known to be aggressive, but the workers can bite and sting.
House ants are not finicky, they will eat most anything. They eat insects, honeydew and almost any household food.
The queen lays one egg a day. The general time frame from egg to adult is 34 to 38 days, with the exception of winter, when it may take 6 to 7 months.