Adult snowy sheathbill (Chionis albus), pair in front of the hut at Port Lockroy, Antarctica, Southern Ocean, Polar Regions

Adult snowy sheathbill (Chionis albus), courtship display on Barrientos Island, Aitcho Island Group, Antarctica, Polar Regions

Closeup of Sheathbill bird, Antarctica, Polar Regions

Closeup of Sheathbill bird, Antarctica, Polar Regions

A Snowy Sheathbill, Chionis albus, in a King Penguin colony at Gold Harbour, South Georgia.

Pale-faced sheathbill (Chionis alba), Antarctic Peninsula, Antarctica, Polar Regions

A curious adult pale-faced sheathbill (Chionis alba) landing on the bow of the National Geographic Endeavour near the Antarctic peninsula

Curious adult pale-faced sheathbill(s) (Chionis alba) alight on Lindblad Expedition Zodiacs on Usefull Island near the Antarctic peninsula

Snowy sheathbill (Chionis alba) on rock, Port Lockroy, Weinke Island, Antarctica, Southern Ocean

Curious adult pale-faced sheathbill(s) (Chionis alba) alight on Lindblad Expedition Zodiacs on Usefull Island near the Antarctic peninsula

Snowy sheathbill (Chionis alba) in and around the Antarctic Peninsula. This bird is also known as the pale-faced sheathbill.

Adult pale-faced sheathbill (Chionis alba) near the Antarctic Peninsula

Detail of a melting iceberg (note the dripping icicles) grounded at Heroina Island in the Weddell Sea, Antarctica. Note the snowy sheathbill on top of the iceberg.

Pale-faced sheathbill on rock, Falkland Islands

Pale-faced sheathbills on imperial shags abandoned nests

Portrait of pale-faced sheathbill, Falkland Islands