Andres M. Dominguez / Black guillemot (Cepphus grylle) adult in flight. Batsfjord. Norway. March

Espen Bergersen / Common guillemot (Uria aalge) calling, bridled guillemot morph with white ring around the eye, Hornoya bird cliff, Finnmark, Norway. March.

Hanne & Jens Eriksen / Black guillemot (Cepphus grylle) taking off, Denmark, May

Wild Wonders of Europe / Liodden / Black guillemot (Cepphus grylle) in flight over water, Spitsbergen, Svalbard, March 2009

Wild Wonders of Europe / Liodden / Black guillemot (Cepphus grylle) diving into water, Spitsbergen, Svalbard, March 2009

Markus Varesvuo / Guillemot (Uria aalge) in flight over water, Norway, July

Roger Powell / Black Guillemot {Cepphus grylle} with Sandeel fish in beak trying to entice a female to his nest site, Caithness, Scotland, UK

Andrew Parkinson / Black guillemot (Cepphus grylle) with a fish in its beak, evening light, Shetland Islands, Scotland, UK, July

SCOTLAND: The Big Picture / Black guillemot (Cepphus grylle) looking out from nest site in a harbour sea wall, Oban Bay, Scotland, UK. June.

Robin Chittenden / Guillemots (Uria aalge) huddled together on cliff face, Bempton Cliffs, Yorkshire, UK. June.

Terry Whittaker / Brunnich's guillemot (Uria lomvia) and Common guillemot (Uria aalge) nesting on sea stack, Hornstrandir Nature Reserve, Westfjords, Iceland.

Terry Whittaker / Common guillemot (Uria aalge) and Razorbill (Alca torda) swimming, Hornstrandir Nature Reserve, Westfjords, Iceland.

Markus Varesvuo / Black guillemot (Uria aalge) in flight. Uto, Finland. April.

Pal Hermansen / Kittiwake (Rissa tridactyla) and Guillemot (Uria aalge) nesting colonies on cliff face. Heimaey, Vestmannaeyjar, Iceland. May.

Terry Whittaker / Scientist using a telescopic pole and wire noose to catch Brunnich's guillemot (Uria lomvia), common guillemot (Uria aalge and Kittiwake (Rissa tridactyla). Staff from Natturustofa Noroausturlands...

Erlend Haarberg / Common guillemot (Uria aalge), Hornoya island. In the last decades, the number of guillemots has decreased drastically along the Norwegian coast, because they do not manage to raise their young due to...

Guy Edwardes / Black Guillemot (Cepphus grylle) with butterfish, Yell, Shetland Islands, Scotland, UK

Andy Rouse / Black guillemot (Cepphus grylle) at sunset on water, Svalbard, Norway, July.

Terry Whittaker / Man being lowered down cliff to collect seabird eggs including those of Black-legged kittiwake (Rissa tridactyla) and Common murre / guillemot (Uria aalge). Skoruvikurbjarg cliffs, Langanes Peninsula,...

Terry Whittaker / Common murre / guillemot (Uria aalge) and Black-legged kittiwake (Rissa tridactyla) eggs in box and egg boxes. Collected from Skoruvikurbjarg cliffs, Langanes Peninsula, Iceland. May 2018.

Terry Whittaker / Common murre / guillemot (Uria aalge), Black-legged kittiwake (Rissa tridactyla) and Gull (Larus sp) eggs for sale at Reykjavik Weekend Market, Iceland. 2018.

Terry Whittaker / Common murre / guillemot (Uria aalge), Black-legged kittiwake (Rissa tridactyla) and Gull (Larus sp) eggs for sale at Reykjavik Weekend Market, Iceland. 2018.

Terry Whittaker / Common murre / guillemot (Uria aalge), Black-legged kittiwake (Rissa tridactyla) and Gull (Larus sp) eggs for sale at Reykjavik Weekend Market, Iceland. 2018.

Terry Whittaker / Man being lowered down cliff to collect seabird eggs including those of Common murre/ guillemot (Uria aalge) and Black-legged kittiwake (Rissa tridactyla). Gannet (Morus bassanus) colony on opposite c...

SCOTLAND: The Big Picture / Back guillemots (Cepphus grylle) interacting on a rock, Shetland, Scotland, UK, April.

SCOTLAND: The Big Picture / Black guillmots (Cepphus grylle) interacting and chasing one another, Shetland, Scotland, UK, April.

SCOTLAND: The Big Picture / Black guillmot (Cepphus grylle) chasing another black guillemot with fish, Shetland, Scotland, UK, August.

Markus Varesvuo / Black guillemot (Cepphus grylle) with fish in beak, portrait. Shetland, Scotland, UK. July.

Markus Varesvuo / Black guillemot (Cepphus grylle) with beak wide open. Shetland, Scotland, UK. July.

Philippe Clement / Black guillemot / tystie (Cepphus grylle) resting on rock ledge in sea cliff, Shetland Islands, Scotland, UK, June

Robert Thompson / Guillemot (Uria aalge), parent and chick in breeding colony. Great Saltee Island, Saltee Islands, County Wexford, Republic of Ireland. June.

Klein & Hubert / Black guillemot (Cepphus grylle) with fish, Svalbard, Norway.

Espen Bergersen / Common guillemot (Uria aalge), Brunnich's guillemot (Uria lomvia) and Kittiwake (Rissa tridactyla) in flight near, Hornoya birdcliff, Vardo, Norway. March

Ashley Cooper / Guillemot (Uria aalge) covered in oil on a black sand volcanic beach at Vik, on Iceland. September 2010.

Ashley Cooper / Guillemot (Uria aalge) covered in oil on a black sand volcanic beach at Vik, on Iceland. September 2010.

Werner Bollmann / Guillemots (Uria aalge) flock in flight, Hornoya, Norway.

Werner Bollmann / Guillemots (Uria aalge) group in mist, Hornoya, Norway.

Werner Bollmann / Guillemots (Uria aalge) colony, Hornoya, Norway. March 2013.

Sandra Bartocha / Common guillemot (Uria aalge) and Black-legged kittiwake (Rissa tridactyla) Hornoya, Norway, March.

Espen Bergersen / Dead bird possibly Black guillemot (Cepphus grylle) caught in discarded fishing net, Rebbenesoya, Troms, Norway, April.

Espen Bergersen / Dead bird possibly Black guillemot (Cepphus grylle) caught in discarded fishing net, Rebbenesoya, Troms, Norway, April.

Jussi Murtosaari / Black guillemots (Cepphus grylle) two flying over sea, Finland, April.