BLACK-FOOTED ALBATROSS (Diomedea nigripes): At-Sea Distribution and Abundance LAYSAN ALBATROSS (Diomedea immutabilis) The following maps represent all At-Sea observations made by personnel of the Pacific Ocean Biological Survey Program from February, 1963, through August, 1965. Each square represents one days observation from the first through the fifteenth of the month, while each circle represents one days observation from the sixteenth through the thirty-first of each month. Numbers refer to the actual number of birds observed during the day. Red indicates the distribution of Laysan Albatross. Green (1-9 birds) and Blue (10+ birds) represent the Black-footed Albatross.