The world's largest tern, the Caspian tern (Hydroprogne caspia) is named after the Caspian Sea, the world's largest inland body of water. Adult birds have black legs, and a long thick red-orange bill with a small black tip. The Caspian Tern aggressively defends its breeding colony – including the world's largest on a small, artificial island in the Columbia River between Oregon and Washington, home to more than 6,000 breeding pairs each year. Its breeding habitat is large lakes and ocean coasts in North America (including the Great Lakes), and locally in Europe (mainly around the Baltic Sea and Black Sea), Asia, Africa, and Australasia (Australia and New Zealand).
