RED-TAILED TROPICBIRD 
Annotated List 
BIHOA 
Dee. 9-16, 1961 
(Kramer) 
Only 1 bird, flying high over island, seen, 
■{June 10, 1962 
(Kramer & B) 
March 6-7? 1964 
(Amerson, POBSP) 
(falker) 
Common, many with eggs 
Population estimate 
Bo. of nests 
Bo. of young - 
30 
none 
Remarks: Courting behavior- 
on nesting site 
In burrows, pre nesting activities. Bo courtship antices -- about 
30. 
July 2& 1964 
(Rr idler) 
A number of Red-tailed Tropicbird nests were discovered under the 
thick vegetation or in the depressions in the rocks and canyons. Best; 
contained eggs to almost full gs?own young. 
.Sept. 23 - 2 4, 196 ■4 
(Fleet, POBSP) 
(Kfidler) 
Counted-: 3 adults, 5 immatures, and ^locals. 
Estimated total population- 50 
We recorded three adults, five immatures, and four locals still 
in their nests. 
March 13-14,1965 
(Banko, POBSP) 
Estimated island total population 
Breeding: Eggs but no young seen. 
Banded--: Bone 
4oo 
(Kridler) 
_____ Estimated 400 on the island but this is extremely rough. I counted 
about 68 in several flocks flying about; and calling duii ng the 
early afternoon. Although about half do^en adults were found on the ground no eggs 
or chicks were found. 
July 28- 
August 1,1966 
(Heiden, POBSP) 
Estimated number 
Bo. of nests 
Bo. of young - 
Age of young - 
Banded - 
11-20 days 
21+ days -■ 
500 + 25 io 
100 + 50 ^ 
20 i 
80 i 
none 
Population in breeding status, distributed over entire island* 
The estimated 100 breeding pairs were with 10-21+ day old young. The 
greatest concentration of this species was in the vicinity of the 
northern cliff face between Miller*s and Tanager Peaks, where 12 large 
nestlings and quite a few flying adults were noted. 
