Regarded as one of the most pervasive and worst ant species, big-headed ants are ⅛ to ¼ of an inch. They are reddish brown in color and come in two varieties, the major and minor workers. They are soil nesters and can commonly make a home under logs, rocks, or even planters. Their nests are often easy to spot, however, due to the large mound of dirt they create by excavating tunnels. If you spot a nest, call your local Indianapolis, IN pest control specialists to remove them.