RED-FOOTED BOOBY --—■'-- Annotated List-■-- LISIANSKX 
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%£#-21 - Aug.31-Sept.5, '67 (RBC-CAE Kept. ) 
Red-footed Booby Population estimate---- 1500 to 2000 
*' ’ ; - Sample nest count results: 
Nests/eggs--- None 
Nests/small downy young--—- None 
Nests/large downy young- Ik 
Number of dependent immatures — c# 400 
Banded - —---—-- *; 262 (adults) 
-- ——-———-« 63 (sub adults 
--- ~~— 7l ( immatures 
—--------- ” 39 & (total) 
Returned ----------—57 (adults) 
* ---- 33 (subadults) 
- ■ None (immatures) 
.-.—- 90 (total) 
• « __ „ .... . - ; ■' 
■ ;« ■« *> 1 ;—_—— . - / \ 
Blood-sampled - 11 (adults) 
—— — --————— 13 (sub'adults) 
-----—« -- • l( i mmature) 
---.-- 25 (total) • 
For the first three nights of our visit all birds handled by one 
! bander were captured,so far as was possible, in a non-discriminatory 
manner) i.e., the first bird reached in a roosting group was captured, 
the nearest bird to it was captured next, and so on. No particular attempt 
was made to concentrate on capturing subadults and birds with bands were 
not preferentially captured. It was hoped that the resultant data might 
give a more accurate representation of the proportion of different age 
groups in the population than normal banding and recapturing methods 
which usually bias the data upward in fayor of subadults. 
Of 150 birds handled in such fashion, 80# were fully adult plumaged 
birds, 17$ were subadults, and 3 $ were independent immatures. One dark- 
phase or intermediate phase adult was seen on the island by both Ely and 
Clapp. 
Ely also made a number of comparative counts in different areas of 
the island. On the northwest part of the island he counted 118 adults 
( 96 $) and 15 immatures ( 4 #); on the northeast part he counted 4-7 adults 
(84#), 8 subadults (14#), and 1 Immature (2#). Twelve adults (75#) and 
four immatures (25#) were counted in the west central Messerschmidia 
tree. - v ' 
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1 # , \ 
Thirty-seven of the 86 returns (43#) whose place of origin was known 
at the time of report-writing were originally banded on other islands. 
Twelve of the 37 (32#) interisland returns were from Johnston; 7 (19#) 
were from Kurej 7 (19#) were from French Frigate Shoals; 5 (14#) were 
from Laysan; and two returns each (2#) were from Wake, Midway, and Pearl 
and Hermes; Reef ♦ '' vr ' - ' ■ 
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