EKDERBURY ISLAND 
DRAFT 
BIRDS 
The total population using the island for nesting was at least 1000 and probably 
and 350 subadult birds 
closer uo ±250* Over 2700 actual birdS'-have been banded on the island since July, 
1963. Recaptures in May, 1965 revealed that over 1% of the population was banded 
and the total population using the island during the year for nesting and or 
roosting'must be between 3,000 and 4,000, 
The Blue-faced Booby population on Enderbury is made up of a number of 
subunits* Each of these has a different affinity for the island and 
a different cycle of appearence on the island* The population can 
be roughly split into a resident population of aaeiiag? adult birds which are 
nesting,*©** have nested in the past or are about to nest 
addition there is 
certain times of the year a considerably population of immature birds^ and a 
floating population of subadultbirds,(in either subadult or adult plumage) and 
adutl adult birds from other islands* This of the population 
~f ~\t Uy 
is always present in one or several large roosting flocks or clubs while the 
first group of birds described above roost singly or in pairs around the island# 
The clubs are located in several favorable locations and are fairly constant 
a H sites each 
in location although >/ given eiub le-ea iien may not be utilized en-eve^y night 
or will individual birds return faithfully to the same eiufe lee site* Nesting 
birds are faithful to their nest site even when they are not nesting* This 
is clearly ehewn-ly seen when feinde nesting birds banded on one trip are recaptured 
are inevitably 
on subsequent trip* The bands will-be recorded in the same sequence in which 
they were used and large gaps in this sequence aivys leuRb-t© indicate 
« 
i© viathat a groups of birds have been overlooked rather than 
that they are absent from the island. 
adult plumaged members 
A comparison of t he^m twe-maiep-divieien-B of the population ani-4he- 
a^-g ^ -G upe - w iihin-them is given in table 
