EOTERBURY ISLAND 
BIRDS 
DRAFT 
T 
j ; 
Red-tailed Tropicbird ( Phaethon rubricauda ) 
Current Status : Common nesting species. 
VSv\evi Q.C. o.w< 4 UD* ^©v^a-o^^Vvo o v£>v\ec8. 
Prior Records ; T»^- tondr e d - were Banded - in . 1 - 9$9 by Kinney and Donagh foo 
>€ Cx»y-eAcfi'*V^C<=> sieves. (DoAa^o, \^^a*)(^ u ^ VD WS xq3 ^ 
fej- QCO-V - ,] ) :, a ^ PC finmp n-f rvf-, i m 4 gnhi i - n ■ >Tu 1 y 1 Q 7 j 8 whm i v . 
%4\w«cv\ We** NoavvAedl So W-e 
aAc* ^*6 cc m) Vv*Aw(j^y\S(SL " __ ^ ^ ^ 
h^-^md^ ^Muiiro bande eh 5 Q~abu±t Si - —Schult e—€' 011 "^'L 1 edru.n e a-dult —in 1939* . ^ 0 
!Ev% , '3a%H<^ <£\ A .>* tv*vvei^ ^OwvvcL&A 5.00 No VxL-Nruaetfvi flovvy Q. <Ky><> » \Si* 
U%^. oc^\Ncc& v&lanxSL AvuJl' e <?U<ec V«c& ©v<e ._ 
<xvv<$. \ouookWl 5 ^%e e*uJl 
Population : Barlngr 
vo« 
ev^efl. W%^. <Sc*\\v>VS£- Ov'^Vd *^e *^a*\SL AnlX* C-e>U<? 0 «ctt. OV<€ _ _r AVlOj'f’ 
visit s "the largest population recorded tos^ r 
* * e '°®Sp ‘ 
^as 20 \*w <re\»vitt^w \^G*\ 
V'vt*^ ** > 5C«<? ^Vu.c\vaaV«> 
1000 and the Bow^e^rThe population 'v&4es with the stage of the 
Sv»oAWvt ^ hi / uj liIF 
"breeding cycle and is highest during the summer months and lowest during 
«y Wyv ^vpvA »l \o £>% off WV»\ ^a^vJuW Vfov*. vs 
the winter. /During the incubation period one adult is present at aJJ* ^ 
imes hut after the chick is a few days old the adults return to the 
island only to bring foo^^(^he^Tctual number of birds present feeding) 
C young at any one tira 
'Vtt-M'V Y \€zbr& G.«vVcUa 
In September^ 
November 
in 
the number j0t birds seen is. only a fraction, * 
i,-+ca v^oasl^ *&* 'fc**#* ** _lM 
if We \<x>m^st' ewwiNoev*:* 
^d June- when 
^vtTwv ^fuwe 
of the number actually using the islan 
0% 'cset&s> Y>a.vje **ovx*c5 
iare^-^ p e e k laufige flocks of tropiebirds a can be. acctt displaying over the 
of ^the^eproductlve^h^le it^tg^ikeiST^that birds"return-^te the island oniy^ 
/ vu b ir^ 5 
-%6/ne&fc< The number of potential^nesters which return to the island but 
t*vice. *Y Laas vwv^\o <fteVew*i*e *^evr 
do not nest is unknown an d would- be-rimp o e - swl e —t - e - ■ 4 q t . e rmne-^ r e m^ h e— ■etort 
oobNf*- s>oy\ cm We i^V^^cA . vv ' a ** # \S\^n4 
vl s - ito made . T W . »n » e.-^.rg^iouev e - jr r ^-iria ag t 500 naffH.ng pairs u&*^^^^fes±and 
Hje W«v VNO 
a nd-there - might b 1 - urH ln g the -i^ lant^-l^icludi n g 1 1 "^^ 
mistce cgs r sf u^hr eed pils . 
months of the 
Annual Cycle : POBSP visits have been made during only 
t o\\ecM& <5Wvvi.«i fc '^ese. 
year but t fee do- 4a j ? a indicate ^ ^ SSIIar - eyel o of n@^4inn . If we co*&*5te r 
^^cibo^ir ^jjyo 
^ incubation period^ 45 days^ and the aygrag^f lodglng time ^ 86 days^ it 
