GREAT FRIGATEBIRD ---Annotated List 
RECKER 
June 17-20,29,1923 
(Wetmore) 
June 17-19 * Common. Rests contain eggs or young to l/3 gtown. 
June 20 : About 300 pairs on the island 
June 27: Eo change. 
July 26, 196 k 
(Kridler) 
[Heavy growth of Chenopodium about a foot to a foot and a half in 
height ..on the slope of Flagpole Hill] is used as nesting sites by frigatebirds. 
...Frigatebird nests contain eggs to half-grown young. In addition there was a 
considerable number of immature birds flying about....I estimated that about 250 
frigatebird nests were found on the island but this is a very rough estimate.. 
Majority of the young frigatebirds were feathered ona the back, wings, top of the 
head, and the breast, with considerable down on the neck... 
Sept. 25,"" 1964 
(Fleet, POBSP) 
Actual count-Immatures 
Locals 
Restlings 
Total population estimate --■ 
Estimate includes 50 $ nest failure. 
(Kridler ) This Chenopodium [grows mostly at the higher parts all over the slopes] 
is used extensively ...by frigatebirds ..for nesting sites.Population estimate-- 
1500-1800. We recorded 375 immature birds, 85 locals still in the nest, and 8 very small 
downy nestlings. 
March 15, 1965 
(Bahko, POBSP) 
Estimated total island population -■ 
Breeding -- 85 0 nests and platforms 
1, 700 
( Kr idler) 
Estimated population of 2,000 birds. We tallied 832 nests and 
estimated that there probably were about 850 . These were found in all areas except 
Rorthwest Cape. Most of them, about 5^0 , are on the north slopes of Summit Hill. 
Ther& seemed to be a greater percentage of immature birds flying above us than 
we noted at Hihoa 
Sept.10-11,1966 
(Kridler) A few downy young. Probably 200 immatures were still on the nests 
Rotes one immature with a red streamer on the left leg but w^ were unable + o capture 
it. Several thousand adults and immatures were flying over the island throughout 
the day. 
March 10, 1967 
(Hackman, POBSP) (Rept) Population estimates 500 adults, 200 nests. (Rotes) About 
200 nests scattered a no und island. Birds were found in little 
clusters on Chenopodium around the edges of the ridges. A number 
of nests, were found on the same slopes as the bulk of the Red-footed Boobies in the 
Chenopodium. This plant species was used for the nest. The majority of nests were 
new construction but empty. Orly 37 of 100 had eggs. ...Measurements given in notes 
for 20 eggs. By candling 7 of 20 were fresh; 11 of 20 were opaque, and 2 were ?. 
Rest descriptions nests on Chenopodium base and constructed almost exclusively of 
Chenopodium twigs. Heights of nests above the ground in inchess 8, 10, 19 , ltk 9 18, 
12, 11, 9, 13, 1^, Diameters of nests in inchess 15? 1^? 13? 17? 18, 16, 15? 
16 , 16 , 12, , . 
