Sea fliers is a term used to describe seabirds that are able to fly over long distances. The three crossword solutions for this term are TERNs, ERNS, and ERNES. TERNs are a type of seabird that are known for their long-distance migrations and graceful flight. ERNS are a type of seabird that are found in both the northern and southern hemispheres and are known for their long wings and powerful flight. ERNES are a type of seabird that are found in the northern hemisphere and are known for their long wings and strong flight. All three of these types of seabirds are considered sea fliers.