Food Army ants are fierce hunters. They mainly hunt on the forest floor, killing other insects, small lizards, and small mammals, but they will also climb trees, killing tree insects, baby birds in their nests, etc. Because the ants move relatively slowly, most large or fast-moving animals are able to escape them. The majority of the 80,000 or so army ants in an average-sized colony are sterile females. These ants are generally either workers or soldiers.
Soldiers are about twice the size of workers, with enlarged heads and jaws.