ATF No. 6 
DRAFT 
5. 
Adults 
No. 
on Nests 
Percent 
Adults and Subadults 
Roosting 
No. Percent 
Banded 
14 
58 
196 
64 
Banded on iJBakerd Is. 
15 
41 
12 
4 
Banded on Howland Is. 
6 
16 
79 
2 6 
Banded on Enderbury Is. 
2 
5 
15 
5 
Banded on Birnie Is. 
— 
— 
2 
n 
Banded on Jarvis Is. 
— 
— 
1 
1 2 
Banded on Phoenix Is. 
— 
— 
2 
-J 
Total 
57 
306 
If we examine the 
figures for nesting birds 
first we 
find that over 
40 percent of the birds nesting 
now were present 
on Baker 
in July. This 
is not surprising since birds on eggs in July would have nestlings now. 
What is surprising is that only 8 of the 57 nesting birds had been banded 
prior to July 1964-. Using data from Howland Island, 40 miles north, we 
4 
find that less than 20 percent of nesting birds and more than 80 percent of 
birds in roosting clubs are unbanded. The nesting birds on Baker must have 
come from this floating population of roosting birds rather than from estab 
lished nesting populations on other islands. 
The data on the roosting birds indicates that most of the birds on 
Baker previously roosted on Howland Island and a smaller number roosted on 
Enderbury. The very small number of birds coming from Birnie and Phoenix 
is hard to explain in view of their closeness to Enderbury and the large 
interchange between these three islands. Differences in population size 
