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SMITHSONIAN GRID Survey No. -36 
/ —7 March 1966 
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This report summarizes observations made in the Smithsonian Grid 
from 1 to 7 March 1966. Members of the Smithsonian Party were Robert 
DeLong, Paul Woodward, and Richard Maze* Excellent cooperation was 
extended by the officers and crew throughout the grid survey. 
During the grid survey 1,350 miles were covered in 140.2 hours. 
Only five legs of the six-legged grid were run (from the NE comer 
to southern end of the fifth leg)• Observations were treated in two 
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categories: diurnal, from sunrise to sunset, and nocturnal, from sunset 
to sunrise. 
Diurnal observations covered 589 miles in 67.5 hours of daylight. 
A total of 815 birds, representing at least fourteen species, was 
seen during diurnal periods of seven days spent in the grid. Sooty 
Terns comprised 86 % of the total diurnal birds. Procellarids accounted 
for only 5$ of the total. The absence of Wedge-tailed Shearwaters was 
noted. 
Nine flocks were seen during diurnal watches; they comprised 84.2$ 
of the diurnal birds. Five of the nine flocks were sighted on the 6th 
of March. Of the 686 birds seen in flocks 96.3$ were Sooty Terns. No 
other species predominated in any individual flocks. 
During nocturnal observation 761 miles were traveled in 72.7 hours. 
A total of 74 birds was -noted either by sight or call. Two species, 
Sooty Terns and Red-footed Boobies, accounted for 68 of the 74 birds recorded. 
* 
