Wiktionary
snow petrel
n. A small, pure white fulmarine petrel with black underdown, coal-black eyes, small black bill and bluish gray feet.
Wikipedia
Snow petrel
The snow petrel (Pagodroma nivea) is the only member of the genus Pagodroma. It is one of only three birds that breed exclusively in Antarctica and has been seen at the South Pole. It has the most southerly breeding distribution of any bird.
Usage examples of "snow petrel".
The only sign of a living thing was a pure white snow petrel that glided through the sky above them like a large snowflake.