Pelagic bird observations during daylight hours were conducted 
aboard the U.S.S. GRANVILLE HALL (YAG 40) from 24 July through 1 August, 
1966* The great circle route between Astoria,Oregon and Oahu, Hawaii was 
followed. During some of the daylight hours from 25-28 July the ship 
was not under way or was reduced from its normal speed of 12.5 knots. 
From 29 July until 2 August it was accompanied by the U.S.S. PATAPS00 
(OG 1). 
Observations were conducted during daylight hours for a total of 
106.5 hours (average of 11.8 hours per day). The ship traveled a total 
of ca. 2300 nautical miles; slightly more than half of this distance 
passed during daylight observation periods. 
Weather was mostly cloudy for the first five days of the cruise 
p 
with occasional fog encountered on the second day. Air temperatures rang- 
o 
ed from the high 50*s (in F) and low 60*s during the first three days, to 
the high 70*s and low 80*s in the la st three days.(See table one). 
Excellent cooperation was received from the officers and crew of 
the U.S.S. GRANVILLE HALL. 
Generally, observations suggested that three zones of bird life 
were sampled: one was within 600 miles of the west coast, one within 700 
miles of the Hawaiian Islands, and lastly the area in between the two. 
Some species overlapped two of the zones? although the central area was 
almost birdless with the exception of Black-footed Albatross? and a few 
migrating shorebirds. 
SPECIES ACCOUNTS 
Black-footed Albatross 
There is no question but what this was the most abundant species in 
