Bryan and Cherry Alexander / Pigeon guillemot (Cepphus columba), in breeding plumage, swimming underwater in aquarium. Living Coasts, Torquay, England, UK.

Marie Read / Pigeon Guillemot (Cepphus columba), pair outside their nest burrow in a cliff face, Montana De Oro State Park, California, USA, July.

Marie Read / Pigeon Guillemots (Cepphus columba), group in breeding plumage on a rock over the ocean, Montana De Oro State Park, California, USA, July.

Marie Read / Pigeon Guillemots (Cepphus columba), group interacting on a rock, one with outspread wings, Santa Cruz, California, USA, July.

Marie Read / Pigeon Guillemots (Cepphus columba), group interacting on a rock over the ocean, Montana De Oro State Park, California, USA, July. (Digitally retouched image - bird at far left, head added from previo...

Marie Read / Pigeon Guillemot (Cepphus columba), viewed from above in flight over the ocean, Santa Cruz, California, USA, July.

Marie Read / Pigeon Guillemot (Cepphus columba), viewed from above, in flight over the ocean, Santa Cruz, California, USA, July.

Marie Read / Pigeon Guillemot (Cepphus columba), taking flight from water carrying a fish in its bill. Santa Cruz, California, USA, July.

Marie Read / Pigeon Guillemot (Cepphus columba), taking flight from water carrying a fish in its bill, Santa Cruz, California, USA, July.

Brent Stephenson / Pigeon Guillemot (Cepphus columba) swimming on a calm sea. Petersburg, Alaska, United States, July.

Suzi Eszterhas / Pigeon Guillemot (Cepphus columba) on water, Monterey Bay, California, USA, April

Matthias Breiter / Pigeon Guillemot (Cepphus columba), Queen Charlotte Islands, British Columbia, Canada

Michael Quinton / Pigeon Guillemot (Cepphus columba) with fish prey, Alaska

Gerrit Vyn / Pigeon Guillemot (Cepphus columba) sitting on exposed rocks, within the intertidal zone. St. Lazaria Island, Alaska, USA, June.

Gerrit Vyn / Breeding pair of Pigeon Guillemots (Cepphus columba) sitting on exposed rocks, in the intertidal zone. St. Lazaria Island, Alaska, USA June.

Gerrit Vyn / Pigeon Guillemot (Cepphus columba) juvenile on water, Clallam County, Washington, USA, August.

Suzi Eszterhas / Pigeon Guillemot (Cepphus columba) pair interacting, Katmai National Park, Alaska

Suzi Eszterhas / Pigeon Guillemot (Cepphus columba) pair, Katmai National Park, Alaska

Konrad Wothe / Pigeon Guillemot (Cepphus columba) group, Alaska

Konrad Wothe / Pigeon Guillemot (Cepphus columba) trio on seaweed, Alaska

Konrad Wothe / Pigeon Guillemot (Cepphus columba) group on seaweed, Alaska

Graham Eaton / Pigeon Guillemot (Cepphus columba) courting pair on water, Alaska, USA, June. Captive bird.

Pete Oxford / Pigeon Guillemot {Cepphus columba} Toporkov Bay, Bering Island, Commander Island, Russia.

Chris Gomersall / Pigeon guillemot (Cepphus columba) diving underwater, captive bird in marine aquarium

Chris Gomersall / Pigeon guillemot (Cepphus columba) diving underwater, captive bird in marine aquarium

Tim Fitzharris / Pigeon Guillemot (Cepphus columba) standing on coastal rock, North America

Shattil & Rozinski / Pigeon guillemot (Cepphus columba) on small chunk of floating ice, Margerie Glacier, Glacier Bay National Park, Alaska, USA, May

Sebastian Kennerknecht / Pigeon Guillemot (Cepphus columba), Santa Cruz, Monterey Bay, California