FAIRY TERN (Gygis alba): At-Sea Distribution and Abundance 
The following maps represent all At-Sea observations made by 
personnel of the Pacific Ocean Biological LSurvey Program from February 
1965 , through August^ 19^5• 
Each square represents one days observation from the first through 
the fifteenth of the months 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. 
Color code: 
= 0 birds 
= 1-10 " 
