were less than three years old but recent research (Woodward, MS) has 
indicated that after 15 months, it is impossible to separate the age 
classes in the field. 
Confusion of this species with the previous species in the field 
is unlikely. In all plumages the Red-billed Tropicbird has extensive 
areas of black in the outer primaries, which the Red-tailed Tropicbird 
does not have. 
White-tailed Tropicbird (Phaethon lepturus ) 
Four White-tailed Tropicbirds were seen south of 10°S. 
Blue-faced Booby ( Sula dactylatra ) 
Five individuals of this species were seen, all of which were 
immatures molting into the first subadult plumage. Sixty percent of 
the birds were seen at 15°N-119°W* 
Red-footed Booby (Sula sula ) 
Only two Red-footed Boobies were seen - one at 9°38 T N and the other 
at 5°^O f S-ll8°56 f W. 
Frigatebird (sp.) ( Fregata ) 
Only one frigatebird was definitely identified to species - a Great 
Frigatebird. It is very likely that all frigates were referable to this 
species. All but one of the individuals were seen south of the equator. 
The greatest number (see figure 15) of birds was seen at the closest 
point to the Marquesas, where these birds probably are from. 
Red Phalarope ( Phalaropus fulicarius ) 
About 33$ the identified phalaropes were of this species, 
although it is very likely that Northern Phalaropes also occurred. 
