RED-FOOTED BOOBY 
Annotated List--- jMjlHOA 
P.2 
Jr 
July 28- 
August 1 ? 1966 
(rleiden, FOBS?) 
Estimated number 
No of nests 
IT).of young- 
Age of young - 
Banded 
• 0-10days 
11-20 days 
21 + days 
3 > 
000 
V 
-p 
25/0 
100 
+ 
25 $ 
1, 
300 
4. 
1 
2 5$ 
10 
! 
1 
4 o 
£ 
50 
7 nestlings and 1 adul 
status* Nesting confined primarily to the 
Population in breeding 
_. ^ ^ c --*-.o «s_j.iica.i. J-JLJ t/J L> iikj 
Iff P f T° ns A T he veg T at,0d slopes, with occasional nests scattered 
“ ear y? 5 OI " Adges or down along gorge edges. This species 
occurrea ooirh in distinct colonies and in random scatterings amon? the 
aieaoer rngatebird colonies. The largest single concentration was 
ouscrvea on one plateau an Miller’s Peak (inter-mixed with the blue- 
-ncua colony)-. ^Of the estimated 150 breeding pairs in this colony, 125 
n “ a young -x*om 10-21+ days; 20 had 0-10 day old nestlings: and 5 were 
on well-devexoped eggs. 
An 
dult roosting population of approximately 100 of this species 
as uuserved on the slope 2$0 yards southeast of Needle Rock;. (Fig 0 3). 
Were e ‘ c ’ '^aoir peak in numbers in early morning and at dusk. 
March 8-9.. 196*7 
(Hackman, FOBS?) 
__________ (Kept )t Population estimates 3000 + adults nesting with eggs. 
(or: 3000+ adults; nests -with eggs.) (Notes) Sprinkled here and 
there over the island^ hundreds on island. Checked 10 nests and 
found 2 mth eggs and 8 with fresh vegetation. Birds are apparently just starting 
to lay... Egg measurements 2 eggss 37-5x65*1 mm., b2.35 x 60.9 mm.; checked kO nests 
and found only two with eggs. The other nests contained fresh vegetation over a 
base of Sida twigs and other vegetation. Birds were apparently just starting to 
creed. 
Sept. 13-1^ 1967 
(Kridler) 
No attempt made to census, but they were very abundant. There were 
chicks of all si^es ? nests contained eggs to young about ready to 
fly. Most of the. nesting takes place in the Chenopodium over 
much of the south part of the island especially at the lower elevations. 
March 7~9? 1968 
(Clapp) 
"ID /n M j^\ T 3 "V /"■v'W > r 
rlwu 
rnrT.r-. nAQr.nno- •nODUiatlOH - - - 
Estimated population « 
xjo uxHia’ceci nsstxu^ 
Number of nests counted - - - - - 
Number of empty nests ------- 
Number of nests with eggs - - - - ■ 
Number of nests with small downy 
young - - - 
O 
60 (55p) 
5+4-6))) 
/> 1 gL} 
'C 
■/+ 
