The largest structure built by insects is the termite mound. These impressive constructions can reach heights of up to 30 feet, depending on the species of termite and environmental conditions. Termite mounds are architecturally sophisticated, featuring complex ventilation systems that regulate temperature and humidity within the nest. The structures are built using soil, saliva, and dung, showcasing the termites’ ability to work together in large colonies. Some mounds also have specific chambers for nurseries and fungi gardens, highlighting the advanced social organization and engineering skill of these remarkable insects.