Rod Williams / Emperor goose (Chen canagica) portrait, captive. Occurs in Alaska and Siberia.

Gerrit Vyn / Emperor Goose (Chen canagica) overhead view of nest and eggs, Yukon Delta National Wildlife Refuge, Alaska, USA June.

Gerrit Vyn / Nest and eggs of Emperor goose (Chen canagica) on the Russian breeding grounds. Chukotka, Russia. July.

Gerrit Vyn / Emperor goose (Chen canagica) on the Russian breeding grounds. Chukotka, Russia. July.

Gerrit Vyn / Emperor goose (Chen canagica) swimming in a partially frozen coastal lagoon on the nesting grounds. Chukotka, Russia. June.

Michael Quinton / Emperor Goose (Chen canagica) pair foraging at water's edge, Alaska

DAVID TIPLING / Emperor Goose {Chen canagica} captive, UK, native to Bering Sea area

Staffan Widstrand / Flock of Emperor geese in flight {Chen canagica} Chukotka, Siberia, Russia.

Nigel Bean / Emperor goose resting with head tucked under wing {Chen canagica} Slimbridge WWT, England, UK

Mark Taylor / Emperor goose (Chen canagica) UK