Termites build their mounds by mixing soil, saliva, and excrement, creating a type of cement that hardens as it dries. The worker termites then use this mixture to construct intricate tunnel systems and chambers within the mound, which can reach heights of over 30 feet. The tunnels help regulate temperature and humidity levels, and the mounds are built in a way that allows for efficient airflow. The construction process is a remarkable feat of engineering, showcasing the impressive abilities of these tiny creatures.