Concept:Social insects -Social insect, any of numerous species of insects that live in colonies and manifest three characteristics:Group integrationDivision of labourOverlap of generations.Social insects are best exemplified by all termites (Isoptera; sometimes Blattodea) and ants (Formicidae) and by various 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 colony, and construct and repair the nest, while the soldiers defend the colony against predators.They establish fungus gardens and feed on them.Explanation:Here other than a beetle, all others are social animals.Hence the correct option is Bettle.