HOWMED 
breeding data 
BLUE-PACED BOOBY -1 
March 19 , 1963 - Wirtz: "There are several hundred masked boobies nesting around the 
island, mostly near the beach, but some inland also." 
—Photographs: Large nestlings, birds on e :gs 
HOWLAND 
BLUE FACED BOOBY 
birds —■—■°* annotated list 
July 6 - 8 , 1983 —- Sibley: "nest thickest around outside of island. In evening 
several groups of 50—100 sub adults roosting. Banded 65d adults 
( 50 $) 55 sub adult s ( 20 &). 10 immature* (50 ^_) _ 
- *" *^***W——fc—efc—»< = 
July 6-8, 1963 — Sibley: "Recorded 90 - 95 % of nest. Thickest around outside of island 
Banded . 55 subadults (20%), 10 immatures ( 50 %), 100 
nestlings plus 19 others for which we didn't have bands, 133 nests 
I'j^r jt a 
with small young, 66 nests with one egg, 139 nests with 2 eggs 
(total of 457 nests), " nest counts are corrected to 100% from actual 
totals 
Y € ✓ 1 f r ( S'e d <\dv/£ t 
OctobB 9-14, 1963 _ Sibley! > fctieeted 3300 bird.. 1873 adult., 17 neetUn*., ,„ a 
^ 50 '“»“*«>• Eetimated 30 i of bird, already banded when we 
arrived, 10 blood samples, 10 skins." 
Octoher 18-31, 196, - Sibley! ■ »™ber of bird, ee-ln, fewer but evidently n»er»u. 
additions since we were able to band 305 adults and 67 immature*. 
October 11, 1963 — Clapp: « Female Masked Booby incubating. She showed no 
v particular orientation to the sun, sitting almost directly sideways 
to the rays. Ivec at 9:00 in the morning she was gaping with 
pronounced fcular flutter. (At what temperature does this mechanism 
- - — ac t ivat **. ) 
