SOCIAL INSECT

any of numerous species of insects that live in colonies and manifest group integration and division of labour. Social insects are best exemplified by termites (Isoptera) and by various ants, bees, and wasps (Hymenoptera). Social insects are differentiated in structure, function, and behaviour into castes, the major ones being the reproductives (e.g., the queen) and the steriles (workers and soldiers). Besides carrying out the basic function of reproduction, the members of the reproductive caste generally select the site for a new colony and excavate the first galleries. The workers care for the eggs and larvae, collect food for other members of the community, and construct and repair the nest, while the soldiers defend the colony against predators.