Tiny Hill Builders is a job description for ants, which are small insects that work together to build large structures. They use their mandibles to carry and move materials, such as soil, sand, and pebbles, to create hills and mounds. These structures can be used for protection from predators, as well as providing shelter and food for the ants. Ants are known for their hard work and dedication, and Tiny Hill Builders is an apt description of their labor.