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

Adult snowy sheathbills (Chionis albus), on ice near Joinville Island, 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

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

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