ENDERBURY ISLAND 
BIRDS 
DRAFT 
13 
The fact that only 16.7 percent of the club birds were recaptured 
while 3 O .7 percent of the non-nesting birds were recaptured would indicate 
that club birds spend a greater proportion of their time at sea. This is 
further supported by the data in Table 
ZL 
which compares recapture rate; 
for different age groups. /Fighty-five percent of the subadult birds were 
in clubs while only one-two percent of the immature birds were in clubs. 
There is a decrease in the percent of the birds recaptured with age from 
16.7 lor adult plumaged birds to 11.6 for subadult birds and only 6.0 for 
immature birds. There is also a greater tendency for the subadult birds 
to be recaptured on other islands. While immature birds are as likely to 
be recaptured on Enderbury Island as on anothereisland. This difference 
is probably due to the difference in home island. All of the immature birds 
were hatched, on Enderbury Island while most of the subadults banded on 
Enderbury Island probably came from some other island. This is supported 
by data collected from a club in May 1965 . Of the 33 banded birds caught 
23 had been banded on other islands. 
Table _. Differential recapture of different age groups of Blue-faced 
Boobies on Enderbury Island. 
Number Percent on Percent 
Banded.Enderbury Elsewhere 
t t T 
Immature birds* 167 _ T 02.k _ 1 03.6 
A summary of the population on Enderbury would indicate that there is 
a resident breeding population of about _. Of _ adult 
plumaged roosting or breeding birds handled in November, 1963 __ were 
present in the __ adult plumaged roosting or breeding birds captured 
