Odorous House Ants (Tapinoma sessile)
Odorous house ants, sometimes called odorous ants, are small (1/20th to 1/16th of an inch), dark brown to black ants, that are monomorphic; they all share a singular structural similarity, which means if one is 1/16 of an inch long, then all the ants in that colony will be 1/16 of an inch long. Visually, these ants can be identified by the touch of brown in their coloring and by the way their abdomen overlaps the single node at their waist. And they have an unevenly shaped thorax when viewed from the side. Odorous house ants get their name from the smell they emit when crushed or threatened, which is similar to the smell of rotten coconuts.
Although these ants prefer eating sweet things, especially honeydew, they will also feed on dead insects or other proteins. Their nests, which can contain thousands of individuals and several queens, can usually be found under boards and rocks and other hard objects. Because of their multiple queens, these colonies will split and multiply quickly if a threat is presented. Inside buildings, these ants often will nest inside walls or beneath floors and they are most likely to invade structures when the weather is rainy. Inside or outside, these ants travel in trails, foraging day and night looking for food.