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All white and short billed. Similar to a feral pigeon in size but slightly larger and longer winged. The Sheathbill family is the only bird family that breeds solely in Antarctica. It's also the only regularly occurring bird in Antarctica without webbed feet. The common name comes from the bony casing (sheath) in which the bill is encased.
Breed only in Antarctica, overwinter as far north as Buenos Aires province in Argentina.
I just came back from an 11 day cruise to the Antarctic peninsula and the wildlife was fantastic! Snowy Sheathbills were a fairly common sight on the ship and on land. I was photographing this one with my telephoto lens on the railing of the ship when it got too close to focus on, that's when I pulled out my iPod Touch and took this shot.