Birds of North America Illustrations

Aleutian Tern Breeding Adult: A medium-sized tern,with white forehead, black cap, black bill and legs, gray underparts and upperparts contrasting with pure white rump and tail. Undertail coverts, malar, and area immediately below cap are also white. Wing projects slightly beyond tip of tail at rest. In flight, underwing has dark subterminal bar on secondaries, pale area on inner primaries, and dark-tipped outer primaries; upperwing shows bold white leading edge and broad dusky lines on at least 56 outer primaries when spread.