Common summer breeder on Dry Tortugas, occasional elsewhere. Summer/fall visitor to warm waters. Sometimes blown onshore or inland in numbers after hurricanes (also similar BRTE). ID: Powerful tern; can be confused with small jaeger. Often flies fairly high in small groups (2–5) but forms bigger concentrations near food. Adult: usually appears strikingly 2-toned black-and-white, including underwing (some browner) with triangular patch on forehead. Juv (often with adults): notably different, appears all-dark at distance. Pale vent, underwing coverts and upperpart spots — compare to noddies.