During the period 24- January - 6 March 1967 the R/V ARGO was 
engaged in oceanographic research in the Eastern Pacific Ocean as 
part of the EASTROPAC Project which is an attempt to develop the 
pelagic tuna resources through a thorough knowledge of the environ¬ 
mental features of the region. The ship departed San Diego heading 
south for 20°N-119°W. Then it sailed south to 20°S-119°W where it 
turned east to 126°W and then north again to 20°N-126°W. From there 
it returned to San Diego. The major area of interest was between 
20°N and 20°S. In this region environmental data^ere collected at 
approximately 20 mile intervals. As part of this program bird and 
mammal observations were made by me for a total of k2 days. This 
preliminary report summarizes these observations. 
A total of 4-29.08 diurnal hours was spent observing while the 
ship traveled 3*354- miles. An additional 15*25 hours of observations 
were made at night while the ship was stopped on stations. 
During the daylight hours a total of 3*917 birds of 38 species 
was seen. Fourteen birds of 4- species were seen at night. Sooty 
Terns (2,3^3) and Leach T s Storm Petrels (74-9) were the dominant 
birds in the whole area. Only one other species (Wedge-tailed 
Shearwater) was seen in numbers greater than 100. 
Tables 1-11 summarize all the observations made and Figures 1-19 
show the distribution of several of the species. Further information 
is provided in the Species Account section. This report is only a 
preliminary report and will be modified after the environmental data 
are'analyzed. 
