DRAFT 
BIRDS 
ENDERBURY IS AND 
Blue-faced Booby ( Sula dactylatra ) 
Cuirent Status: Common resident. 
Prior Records: On the Wilkes Exploring Expedition (Cassin, 1858) in £$ 1840 and 1841 
are stated to have been most abundant on Honden and Enderb^ Island* In January they 
were found "sitting and hatching" on Enderby^k island*Kinney banded 150 adults in 
the spring of 1939. Except for vague references to "boobies" or 
"gannets" there is no other mention in the literature of this species* 
Population: The population on the island varies greatly during the year and in both 
1963-1964 1964-1965 
i9&e* and 1945 the smallest numbers have been present in February and May and the 
largest numbers in July and November* 
There is- appears to be a delayed correlation between the number of nests 
and the number of birds on the island* The largest number 
of birds is present in November when the number of nests has already decreased 
ur 
considerably from its summer peak* On the other hand the flow numbers in February 
and May are associated with little or nof nesting activity* 
The population is several times greater than the number of nesting birds 
Table 
down 
in table 
.. % 
.e 
Comparison of nesting and 
non-nes 
ting Blue-fa 
,ced Boobies 
on Enderbury 
# Nesting Birds 
No* : 
non-nesting 
Bird °/ 
0 of birds 
nesting 
July 
1963 
792 
c 
1100 
m. 7 
Nov* 
1963 
202 
c 
1500 ' 
it. ^ 
Feb* 
1965 
0 
c 
400 
00. 0 
July 
1964 
848 
c 
750 
st. 0 
Nov. 
1964 
622 
c 
itioo 
31 . [ 
Feb. 
1965 
36 
c 
750 
OH- S 
May 1965 
148 
c 
0 
%.l~ ( 
> \ 
