January 1965 - BCF cruise 7 General Discussion The considerable increase in total numbers from 1368 in December to 2960 in January was due wholly to a large movement of Sooty Terns into the area concurrent with the beginning of their breeding season on Moku Manu, Oahu. Birds in flocks comprised 2546 birds or 86% of the total. Sooty Terns alone comprised 90% of birds in flocks and 91% of total birds. This represents the greatest domination of the total population by a single species to date. Leach's Petrels, Black-footed Albatrosses and Fairy Terns also rose in numbers but their low total numbers are poorly reflected when the population of the area is con- sidered as a whole. Direct migrants were almost totally absent from the area (3) and species which utilize the area mainly as a wintering range decreased in number sharply so that they accounted for only 6.1% of the total. Significant sight records included three gulls in Pearl Harbor, a possible Black-browed Albatross, a Phoenix or Tahiti Petrel, a possible Pink-footed Shearwater, and 16 Kermadec Petrels, a new high. Three Black-footed Albatrosses were banded and one Leach's Petrel was collected. Two distinct areas of concentration occurred, within a 200 mile radius of the high Hawaiian Islands and in the extreme southern end of the area. These two areas were similarly densely populated in the early spring of 1964.