RED-TAIL TROPICBIRD (fcPhaethon rubricauda): At-Sea Distribution and Abundance 
The following maps represent all At-Sea observations made by 
personnel of the Pacific Ocean Biological Survey Program from February, 
1963 through Aughst, 1965. 
Each square represents one days observation from the first throughl 
the fifteenth of the month, while each circle represents one days 
$ 
observation from the sixteenth thro^h the thirty-firfst of each month.. 
Numbers refer to the actual number of birds observed during the 
day. 
Color code: 
= 0 birds 
- = 1-10 " 
