NHITE-TAIL TROPICBIED ( Phaethon lepturus ): At-Sea Distribution and Abundance 
The following maps represent all At-Sea observations made by 
personnel of the Pacific Ocaan Biological Survey Program from Februg^ji^ 
1963, through August, 1965. 
Each square represents one days observation from the first throguk 
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 birds 
= 1 - 10 $ ^ 
— = 11-50 
= 5li 
T! 
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