Caspian Terns, the largest tern species in the world, are uncommon but regular visitors to Arizona, particularly during migration in spring and fall. They are most often seen at large reservoirs, lakes, and river systems such as Lake Havasu, the lower Colorado River, and occasionally at inland lakes like Lake Pleasant or the Salt River lakes. With their large size, thick red bills, and loud, raspy calls, they are distinctive and easy to recognize. While they do not breed in Arizona, their seasonal appearances provide exciting sightings for birders, especially when they fish with powerful, direct dives into open water.
