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.

Jacob S. Spendelow / Red-legged Kittiwake (Rissa brevirostris), Alaska

Oriol Alamany / Red-legged kittiwakes (Rissa brevirostris) on rock, Saint George Island, Pribilof Islands, Alaska, USA

Oriol Alamany / Red-legged kittiwake (Rissa brevirostris) landing on cliff, Saint George Island, Pribilof Islands, Alaska, USA

Oriol Alamany / Red-legged kittiwake (Rissa brevirostris) in flight, Saint George Island, Pribilof Islands, Alaska, USA

Oriol Alamany / Red-legged kittiwakes (Rissa brevirostris) nesting on cliff, Saint George Island, Pribilof Islands, Alaska, USA

Matthias Breiter / Red-legged Kittiwake (Rissa brevirostris) nesting on cliff, Pribilof Islands, Alaska

Matthias Breiter / Red-legged Kittiwake (Rissa brevirostris) carrying nesting material, Pribilof Islands, Alaska

Michio Hoshino / Red-legged Kittiwake (Rissa brevirostris) group perched on nesting cliffs, Alaska

DAVID TIPLING / Red-legged kittiwake {Rissa brevirostris} St Paul Is, Bering Sea, Alaska, USA. Vulnerable

Yva Momatiuk & John Eastcott / Red-legged Kittiwake (Rissa brevirostris) group perched on nesting cliffs, Bering Sea, St George Island, Pribilof Islands, Alaska

Philip Stephen / Red-legged kittiwake (Rissa brevirostris) perched on handrail of a fishing vessel.

Philip Stephen / Young Red-legged kittiwake (Rissa brevirostris) perched on a fishing vessel.

DAVID TIPLING / Red-legged kittiwake on cliff {Rissa brevirostris} Pribilof's Is, Bering sea, Alaska vulnerable

DAVID TIPLING / Red-legged kittiwake calling {Rissa brevirostris} Pribilof's Is, Bering sea, Alaska vulnerable

DAVID TIPLING / Red-legged kittiwakes on beach {Rissa brevirostris} Pribilof's Is, Bering sea, Alaska vulnerabl

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...

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

Marie Read / Three Red-legged kittiwakes (Rissa brevirostris) and a Black-legged kittiwake (Rissa tridactyla) perched on a rock along the shore, St. Paul, Pribilof Islands, Alaska, USA. August.

Marie Read / Red-legged kittiwake (Rissa brevirostris) pair perching on cliff with chick in nest and preening, St. Paul, Pribilof Islands, Alaska, USA, July.

Marie Read / Red-legged kittiwake (Rissa brevirostris) pair perching on cliff with chick in nest, which peers out from behind parent, St. Paul, Pribilof Islands, Alaska, USA, July.