Ants are social insects that live in a colony, usually consisting of thousands to tens of thousands of individuals. Within the colony are various ant “castes” of different forms and function. Colonies are overwhelmingly comprised of workers, wingless females that forage for food, construct, maintain and defend the nest, tend the young and do other necessary colony duties. Many kinds of ants produce workers that are all the same size (monomorphic); some, such as field ants, have workers that vary in size (polymorphic).