BLUE-FACED BOOBY ( Sula dactylatra ): At-Sea Distribution and Abundance 
The following maps represent all At-Sea observations made by 
personnel of the Pacific Ocean Biological Survey Prggram from February, 
1963, through August, 1965 . 
Each square represents one days observation from the first through 
the fifteenth of the month, 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 
= 1-10 
<*£' • ' — 11“ 30 
- 50 + 
birds 
jrr 
n 
M 
» 
