Fish-eating birds are a type of bird that feed on fish as their primary source of food. Darters, ospreys, erns, and erne are all species of fish-eating birds. Darters are a type of cormorant found in tropical regions, while ospreys are a type of hawk found in temperate regions. Ern and erne are both types of seabirds found in the Northern Hemisphere. LOONS are a type of aquatic bird found in North America and Eurasia. All of these birds have adapted to hunt and consume fish as their main source of food.