Gerrit Vyn / Red-legged kittiwake (Rissa brevirostris) on a nest. St. George Island, Alaska. July.

Graham Eaton / Red-legged Kittiwake (Rissa brevirostris) on sea. Alaska, USA. June.

Ole Jorgen Liodden / Red-legged kittiwake (Rissa brevirostris) on cliff with guano, Commander Island, Russia. September. Vulnerable species.

Marie Read / Red-legged kittiwake (Rissa brevirostris) in breeding plumage, perched on rock on the shore, St. Paul, Pribilof Islands, Alaska, USA. July.

Marie Read / Red-legged kittiwakes (Rissa brevirostris) pair with chick at nest on narrow cliff ledge, St. Paul, Pribilof Islands, Alaska, USA. August.

Marie Read / Red-legged kittiwakes (Rissa brevirostris) pair with chick at nest on narrow cliff ledge, one adult is preening the chick while the other is calling, St. Paul, Pribilof Islands, Alaska, USA. July.

Marie Read / Red-legged kittiwakes (Rissa brevirostris) pair defending their nest and large chick from an intruder, St. Paul, Pribilof Islands, Alaska, USA. August.

Marie Read / Red-legged kittiwakes (Rissa brevirostris) pair defending their nest from an intruder, with parent mantling over chick for protection, St. Paul, Pribilof Islands, Alaska, USA. August.

Marie Read / Group of Red-legged kittiwakes (Rissa brevirostris) perched on a rock along the shore, two calling as another flies overhead, with a Black-legged kittiwake (Rissa tridactyla) perched behind, St. Paul,...

Marie Read / Group of Red-legged kittiwakes (Rissa brevirostris) adults in breeding plumage, perched on a rock in water, two calling aggressively as an immature Kittiwake lands between them, St. Paul, Pribilof Isl...

Marie Read / Red-legged kittiwake (Rissa brevirostris) in breeding plumage perched on narrow cliff ledge, St. Paul, Pribilof Islands, Alaska, USA. July.

Marie Read / Two Red-legged kittiwakes (Rissa brevirostris) in breeding plumage, perched on a rock in water, one calling and raising wings aggressively at the other, St. Paul, Pribilof Islands, Alaska, USA. August...