<P> The workers of army ants are usually blind or can have compound eyes that are reduced to a single lens . There are species of army ants where the worker caste may show polymorphism based on physical differences and job allocations; however, there are also species that show no polymorphism at all . The worker caste is usually composed of sterile female worker ants . </P> <P> The soldiers of army ants are larger than the workers, and they have much larger mandibles than the worker class of ants, with older workers possessing larger heads and stronger mandibles than the younger ones . They protect the colony, and help carry the heaviest loads of prey to the nest . </P> <P> Males are large in size and have a large cylindrical abdomen, highly modified mandibles and uncommon genitalia not seen in other ants . They have 13 segments on their antennae, are alated (have wings) and therefore can resemble wasps . Males are born as part of a sexual brood . As soon as they are born, they will fly off in search of a queen to mate with . In some instances where males seek to mate with a queen from an existing colony, the receiving workers will forcibly remove the wings in order to accommodate the large males into the colony for mating . Because of their size, males are sometimes called "sausage flies" or "sausage ants ." </P> <P> Colonies of real army ants always have only one queen, while some other ant species can have several queens . The queen is dichthadiigyne (a blind ant with large gaster) but may sometimes possess vestigial eyes . The queens of army ants are unique in that they do not have wings, have an enlarged gaster size and an extended cylindrical abdomen . They are significantly larger than worker army ants and possess 10--12 segments on their antennae . Queens will mate with multiple males and because of their enlarged gaster, can produce 3 to 4 million eggs a month, resulting in synchronized brood cycles and colonies composed of millions of individuals all related to a single queen . </P>

Where do army ants live in the world