Saw some Albatrosses and petrels, and in the evening an Egg bird or Tern which lighted on the ship was caught but differ’d from all any of us had seen before. It was about the size of the common Tern or sea swallow with the head, back and coverts of the wings finely variegated with black and white, the rest of the body being nearly white and the Bill and feet black.
Source: wiktionary