GREAT FRIGATEBIRD-Annoated List 
ETHOA 
Dec. 9-16, 1963 
(Kramer) 
Very abundant. Large flying young. Ho eggs seen. Very few males 
seen with gular sac inflated. 
June 10 , 1962 
(Kramer & B) Half-grown downy young on nests. Ho males seen in nuptial displays 
March 6-7?196 A 
(Amerson, PQBSP) Population estimate--- 10,000 Remarks : Most on eggs, 
Ho. of nests - A, 800 courtship behavior 
Ho. £>f young--- 10 
(Walker) ___ Most numerous, widespread bird on island. Most adults on eggs, a 
few newly hatched young. Most full grown young in air. ... 
July 2B, 196 A 
(Kr idler) 
___ Hesting by frigatebirds was in full swing and all nests examined 
contained young, most of which were in the downy stage. However, 
there were some which were feathered out considerably and most of the nesting takes 
place in the heavy growth of Chenopodium, especially those near the top of East Palm 
Canyon, the central gulch, and the top of Miller Canyon. 
.Sept. 23-2 A, 196A 
(Fleet, PQBSP) 
(Kridler) 
Counted: 1002 immatures and 167 locals. 
Estimated total population-6, 000 
5-6000, approximately 1000 of which were immatures. We counted 167 
locals still in the nest; most of these were quite large with a 
little bit of down around the neck. Many of the immatures were 
flying. 
March 13-lA,1965 
(Banko, PQBSP) 
.(Kridler) 
Estimated island total population-5? 200 
Breeding: 1,700 nests; eggs only; 5 $ immature 
Banded--: Hone 
There were an estimated 5* 200 birds on the island and approximately 
2,500 nests. About 70 percent of the nests contained eggs. There 
was considerable displaying by adult males on nests which as yet contained no eggs. 
We assumed a sex ratio of approximately 50-50. Ho chicks were noted in any of the 
nests. Large concentrations are to be found along the gulch side almost up to the 
peaks. Most- are in clumps of Sida and Chenopodium. There were a few immatures 
about and we estimated that this was less than 5 percent although it is possible 
that we may have missed some which were away from the island during the day or which 
were soaring high above us. One very large immature bird was still being fed by an 
adult female. One hundred 50 to 200 birds were observed in the air over the west end 
of the island and it was thought that perhaps the total over the entire island amounted 
to approximately 600 birds. 
