Marie Read / Abstract patterns of reflected sky and clouds on the ocean with a silhouetted Red-faced cormorant (Phalarocorax urile) in flight, St. Paul Island, Pribilof Islands, Alaska, USA, July.

Erlend Haarberg / European shag (Phalacrocorax aristotelis) sitting at the entrance of a cave with flock of Common guillemots (Uria aalge) and Gulls (Laridae) flying past cave, Hornoya and Reinoya Nature Reserve, Finnm...

Espen Bergersen / Atlantic puffin (Fratercula arctica) and European shag (Phalacrocorax aristotelis) Hornoya, Finnmark, Norway. March.

Espen Bergersen / European shags (Phalacrocorax aristotelis) in courtship display. Hornoya bird cliff, Finnmark, Norway. March.

David Pattyn / Shag (Phalacrocorax aristotelis) flying with nesting material, Hornoya, Varanger, Finnmark, Norway, May.

David Pattyn / Shag (Phalacrocorax aristotelis) spreading wings to dry, Hornoya, Varanger, Finnmark, Norway, April.

Markus Varesvuo / Common shag (Phalacrocorax aristotelis) flying, with the sun in the background, Vardo, Norway, March.

Markus Varesvuo / Flock of Common shags (Phalacrocorax arostotelis) resting on a cliff, with wind blown snow, Vardo, Norway, March.

Erlend Haarberg / European shag (Phalacrocorax aristotelis) flying between coastal rocks with a large wave crashing, Snaefellsnes peninsula, Iceland, February 2011

Juan Carlos Munoz / Imperial shag / Blue eyed cormorant colony (Phalacrocorax atriceps), showing birds on nests, with one bird flying above. Patagonia, Argentina, March 2008

Edwin Giesbers / Shag (Phalacrocorax aristotelis) looking curious, Farne Islands, Northumberland, UK

Edwin Giesbers / Shag (Phalacrocorax aristotelis) preening close-up, Farne Islands, Northumberland, UK, June

Wild Wonders of Europe / Hermansen / Shag (Phalacrocorax aristotelis) calling with wings stretched out, Saltee Islands, County Wexford, Ireland, June 2009

Wild Wonders of Europe / Hermansen / Shags (Phalacrocorax aristotelis) standing on coastal cliff, Saltee Islands, County Wexford, Ireland, June 2009

Wild Wonders of Europe / Hermansen / Shag (Phalacrocorax aristotelis) on cliff, Saltee Islands, County Wexford, Ireland, June 2009

Markus Varesvuo / Shag (Phalacrocorax aristotelis) at nest site, Norway

Guy Edwardes / Close-up of feathers of Shag (Phalacrocorax aristotelis) Saltee Islands, Co. Wexford, Ireland, June

Oscar Dewhurst / Shag (Phalacrocorax aristotelis) adult in flight over the sea. Farne Islands, Northumberland, UK. July.

Doug Gimesy / Pied cormorant (Phalacrocorax varius) standing on intertidal rocks, sea in background. Port Philip Bay shoreline, Sandringham, Victoria, Australia.

Doug Gimesy / Pied cormorant (Phalacrocorax varius) standing on intertidal rocks, sea in background. Port Philip Bay shoreline, Sandringham, Victoria, Australia.

Doug Gimesy / Pied cormorant (Phalacrocorax varius) standing on intertidal rocks, sea in background. Port Philip Bay shoreline, Sandringham, Victoria, Australia.

Doug Gimesy / Pied cormorant (Phalacrocorax varius) standing on intertidal rocks, sea in background. Port Philip Bay shoreline, Sandringham, Victoria, Australia.

Doug Gimesy / Little pied cormorant (Microcarbo melanoleucos) in flight. Sandringham, Victoria, Australia.

Doug Gimesy / Little pied cormorant (Microcarbo melanoleucos) perched on branch protruding out of water. Eden NSW, Australia. June

Doug Gimesy / Little pied cormorant (Microcarbo melanoleucos) perched on branch protruding out of water. Eden NSW, Australia.

Tui De Roy / Rock cormorant (Phalacrocorax magellanicus) nesting on cliff face, Beagle Channel, Patagonia, Argentina

Tui De Roy / Red legged cormorant (Phalacrocorax gaimardi) nesting on cliff ledge, Tilgo Island, La Serena, Humboldt Archipelago, Chile.

Ashley Cooper / Antarctic shag (Leucocarbo bransfieldensis) on iceberg. Foyn Harbour, Wilhelmina Bay, Antarctica. December.

Robert Thompson / Shag (Phalacrocorax aristotelis) on nest, with netting in amongst the nest material, Great Salteee Island, Co. Wexford, Ireland, May

Espen Bergersen / A group of European shags (Phalacrocorax aristotelis) resting on a rock. Coast of Troms, Northern Norway.

Niall Benvie / Shag (Phalacrocorax aristotelis) silhouetted, Lunga, Scotland, UK, May.

Jenny E. Ross / Seabird colony on off-shore rocks in the Bering Sea near Verkhoturova Island, Russia. The nesting species include common and Brunnich's guillemots (Uria aalge and Uria lomvia arra -- also known as...

Jenny E. Ross / Ecotourists view a seabird colony on off-shore rocks in the Bering Sea near Verkhoturova Island, Russia. The nesting species include common and Brunnich's guillemots (Uria aalge and Uria lomvia ar...

Jenny E. Ross / Seabird colony on off-shore rocks in the Bering Sea near Verkhoturova Island, Russia. The nesting species include common and Brunnich's guillemots (Uria aalge and Uria lomvia arra -- also known as...

Jenny E. Ross / Pelagic cormorant (Phalacrocorax pelagicus) flies from the water after catching a tiny fish, in the Bering Sea near Medny Island in the Commander Islands, Russia.

Jenny E. Ross / Pelagic cormorant (Phalacrocorax pelagicus) with large chicks on a cliffside nest at a huge seabird colony on Kolyuchin Island, Chukotka, Siberia, Russia.

Jenny E. Ross / Pelagic cormorant (Phalacrocorax pelagicus) with large chicks on a cliffside nest at a huge seabird colony on Kolyuchin Island, Chukotka, Siberia, Russia.

Jenny E. Ross / Pelagic cormorant (Phalacrocorax pelagicus) with large chicks on a cliffside nest at a huge seabird colony on Kolyuchin Island, Chukotka, Siberia, Russia.

Jenny E. Ross / Pelagic cormorant (Phalacrocorax pelagicus) pair with large chicks on a cliffside nest at a huge seabird colony on Kolyuchin Island, Chukotka, Siberia, Russia.

Jenny E. Ross / Pelagic cormorant (Phalacrocorax pelagicus) on cliffside nest at a huge seabird colony on Kolyuchin Island, Chukotka, Siberia, Russia.

Jenny E. Ross / Pelagic cormorant (Phalacrocorax pelagicus) near Common guillemots (Uria aalge inornata) on its nest with chicks, Kolyuchin Island, Chukotka, in the Chukchi Sea, Siberia, Russia.

Robin Chittenden / Shag (Phalacrocorax aristotelis desmarestii) perched on rock near beach, Mallorca, August 2019

Robin Chittenden / Shag (Phalacrocorax aristotelis desmarestii) Mallorca, August.

Robert Thompson / European shag (Phalacrocorax aristotelis) on rocks, Great Salteee Island, County Wexford, Ireland, June.

Robert Thompson / European shag (Phalacrocorax aristotelis) on rocks, Great Salteee Island, County Wexford, Ireland, June.

Robert Thompson / European shag (Phalacrocorax aristotelis) on rocks, Great Salteee Island, County Wexford, Ireland, June.

Doug Gimesy / Little pied cormorants (Microcarbo melanoleucos) two standing either side of a Pied cormorant (Phalacrocorax varius) on coastal rocks, Ricketts Point, Beaumaris, Victoria, Australia. May.

Doug Gimesy / Little pied cormorant (Microcarbo melanoleucos) on rocks by the shore. Ricketts Point, Beaumaris, Victoria, Australia. May,