EROftN BOOBY 
Annotate^, List — p.3 
LISIANSKI 
LS# 18 Mar.10-20, ’67 (CDH Rept) 
Population Estimate — 
15 + adults roosting 
(CDH-Mar,20) 15 birds were loafing along the north shore ajid several oter s 
were found in the interior. No nests or y6ung were observed. 
L $ 19 June 2-6, f 67 (DLS Rept) 
Population Estimate 
Nests - 
7 5 adults 
10 
Nests were in one area just south of main camp, along the highest part of the 
island and about 100 yards from the beach. < Dave and I counted 10 nes^s with j 
eggs, 5 nests with small -chicks, and 3 nests with medium Sfzed chicks. 
Adults were roosting along the beach, in Sea orola, toward the south end 
of the island. I would estimate a total of 75 adults on the island. J 
(FCT) Total population estimate: 20. Actual count of 8 nests. All stages of 
the life cycle were found except large downy chicks and iramatures indicating 
that the cycle is about half way through. The birds were mainly in the Scaevola 
morning glory belt. 
Brown Booby 
> Population estimate--—*-————- IfO 
v - Nests/l egg ------ ——■—>—- • 1 
Nests/large downy young -----—----- 4 
Number dependent immatures observed -- 2 
',/■ Banded----—-—■—-— -.——* 29 (adults) 
-- 3 (immatures) 
large downy, chick __=__ 4 
.-.-. % (total) 
*' Returned-■*-—- 4 * (adults) 
• \ { *" ■ */" . . \ 
The nest count figures given above are considered to be very close 
to the actual totals for the island since many hours were spent making 
nest counts of the interior of the island with the result that yery few 
nests could have been overlooked. 
The breeding birds were found in two low, Ipomea- covered openings 
in the Scaevola on the south-central and southwestern interior portions 
of the island. Other adults were found roosting near the breeding areas 
and a few (about four) were found roosting in the Scaevola above the west 
beach. In addition a single male was seen rooting by himself above the 
cutbank at the southeast end of the island >; ancLone .adult roosted regularly 
with the club pf Blue-faced Boobies at the'south point of the island. 
The sex ratio of 3.2 of the 33 adult Brown Boobies handled was strongly 
biased in favor of females. Twenty-one of the 32 adults ( 66 $) were fe¬ 
males. Since we believe that we handled oyer 90$ of the Brown Boobies 
present on the island, this datum suggests some sex-segregated difference 
in behavior. ' • . 
* 
One of the Brown Boobies handled (an adult male) was marked with an 
orange streamer. v ' 
