i\i7TL ppJT^Y 
aMi-'lji gCUIU 
Ti * T”rn o 
1, i’iii' 1 A. 
jirds 
•' \ 
-/ 
i 
11 
Table 
i\j 
est Counts of Bluc-f-iced iooby on Knuerbury Island 
February 
May 
1963 
1964 
1965 
0 
18 (33%) 
July 
396 (69;:) 
424 (52 %)j 
November 
ioi ( 29 ?:) 
311 ( 20 %) 
74 (66/) 
The first figure l^.rclsiT t rg the number of nests 
_ i it"!- 1 i o. the proportion of nests with yggs 
and the second, 
Reproduction: Blue-i" .ced Boobies nest on all parts of /he island but the heaviest 
concentration of nests is on the west side from the /guano hill" to the south 
end of the island. In July 1964 ^the area from the lighthouse to the south end 
of the island contained 51 percent of the nests and the area from the lighthouse 
north to the "guano hill" contained 28 percent ^f the nests. Most of the 
r rcent oJ jus 
or on the east side of the island opposite/the central lagoon. 
u n the west side of the island the bests are fairly evenly distributed from 
the edge of the lagoon or central depression to the beach crest although 
some -j.rcbas ■ -re not /.zed lor nesting. On the r st of the 
island 
nests are usually in 
small aieas of Sesuvium between 
rid#ges 
of coral rubble 
The birds nest infrequently in the central depression and on the numbrous 
rge areas of nearly bare/coral rubble. 
f 
■ -• - - . • • . ff . ■ ' 
Most nests contain |wo eggs and five of the 627 examined have cont.lined 
'■ I - 
- - - / 
three eggs. We have noj record of two young in the same newt more than 
five days aft c ing. 
Since the Bl&e-faebd Boob Mas a long incubation and fledging period 
(W i£0- e i \ c y>£-) 
^ we— greeted— there should have been about 300 young on the island in November 
/ • ‘ * - - - ' " ~ 
1963 (see Appe] . L ever there were or..... 72 young present at is i . 
which indicates that at least 75% of hue n . confining eggs m uuly sailed. 
