ENDERBURY ISLAND 
RAFT 
L/\ V» ^y€€>&5> OA\ VvaovaV^^? O^r •Ma€. v^i^O.'T 
Brown Booby (Sula leucogast er) 
^Status : common resident nesting s^e^s. ' w <s»vwcA\ v\ ^LwySoc^c, „ 
VyW ^.^v<iCo^ Vql^ Un^ P r^p ; v / y .. X^ YiV\ .i a <-1^ . rlAo, j O m*<S ^ C ‘ C ^ » 
Prior Records: The-^cm2y^~prder~recoTd~i^^c n (Gas sin 
- I- lia c. V&>f» CZ VaA^ ^ - Q V ' K \J V Vgl ’g L iH in A-V >a. n a. >Vs ' ct/v - -W 
-a#—p^ed^nt. np-viU 
> c 
Ccts-S'v^ (h < g</§‘5 ve^'OV'Ved NbvCxV ^Ue. «>^e.C.re.£» Oav, ^>re3*€^.V X 
Population: The largest numbel ^gnst rr ft rate- on^any- 
In November, 
estes3SB±ed ^opVcxWovx vecoJelv^r/e^^Sp ^a,s «v> ^Wv*a^ 
I 963 and. the lowest number was 100 in July and November, . 19 Oh - ighB - 
popularfc ion 
Over 150 
adults have been banded and in February, 1965 approximately 50 percent of 
the 60 birds observed were banded. This would indicate that the population 
is only slightly larger than the 300 estimated in November, 1963 * antilfett 
Approximately 50 percent of the population is present cfn any one day. 
The/largest/br^eding population wps ^6 ±ji No^emb^r,^ 19-^3 And. 
smallest 2,6 in /February /19 6k. j The nesting populptipu usudlly^comi: mses. 
/ / / I 9 i / // / I if i 1/ /[/ 
about 50 percent of the total population on fche/jisland alth It w 
/ i i ■ 1 • /%!}■* I • h i 1 ■ 
/1 
i / 
// ! i 
l 
percent in November 1963 and ±3 panejgnt bin Fbbruai(y, l96A; ^ 
/ U)e wc>f-We^ c*h)e^ U> JL^V^wv^we. v^VeVOvev- ' 
Annual Cycle : The-pres'errde-'“Of'.ah^ahhual^cycte-ls.not~norteln--^ 
•Q aIvv*^, 6v\cS€v'\?'<A.^-i^ V}Vt>>uuvA \j> cre>Ot-3 Vvc*-\)6. <3cv\. Ckv\v\'-Vtx.\ 0 V . c 
any“'evidehle^ox'n:^d.eflnite---nycle-..of.-.--any-length> 
sn 
During the seven POBSP trips to 
/ 
Island^three peaks in the-m 
/ / 
breeding cycle have been observed. These are approximately eight months' 
9 / /-■ V / die v*\ c^sV^Ve / 
apart/but the visits have been too infrequent, to show" t he actual existence 
/ 
of such a cycle. The peaks are minor and there/is always a considerable 
j 
amount of nesting at all times so that' the pedks may be the result of random 
. / / / / / / 
/ 
/ 
/variation ini a species which'will,.nest whenever it-'is able. - ( 
// ^" / / iyy- ■ 
u 1965) 
Ibis, 
/ 
