The term 'Small Hill Builders' refers to ants, which are four-letter creatures that are known for their ability to build small hills or mounds of soil. Ants are social insects that live in colonies and work together to build these structures. They are also known for their industriousness and strength, as they can carry objects many times their own weight. Ants are found all over the world and play an important role in the environment by aerating the soil and helping to recycle nutrients.