The red bull ant is one of the largest species of ants in the world. They have a venomous sting that is capable of causing severe pain for a day or two. Red bull ants have yellowish mandibles, reddish-brown head and thorax and front part of abdomen. The rear half of the gaster (the bulbous part at the rear of the abdomen) is black. The head is slightly broader than it is long and the mandibles are slightly longer than the head. The mandibles are long and fairly straight with twelve teeth (the third, fifth, seventh, and ninth teeth are longer and sharper than the others). The queen is similar to the workers but larger and more robust.