The term GULLS' COUSINS is referring to the bird species known as Terns, which are a type of seabird that are closely related to gulls. Terns have a distinctive forked tail and long wings, and they are known for their graceful flight and aerial acrobatics. They are found in many parts of the world, including coastal areas, islands, and inland lakes. Terns feed on small fish and invertebrates, and they often nest in large colonies.