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BONIN FEEREL 
Annotated List — p*3*—•— 
LISIANSKE 
'UN 4 I 
L# 19 June 2-6, '67 (DLS Kept) 
Estimated population 
Number of nests —— 
100 adults , 
250 
Four dead ehieks and a ehiofc and an adult were found on the island. I also 
saw five live chicks at night while banding; these were about ready to fly. 
Probably no more than 250 chciks were on the island during our stay. There , 
were fewer adults seen than chicks. 
LS# 19 JUne 2-6, '67 
(FCT) Total remaining population; est. 50. A few dead immature 
plumage birds ( 3 ) were dounf duding the day survey of the 
island and I saw no live chicks at night . However, I found 
one adult bird in the middle of the Sooty colony— 
roosting ?? 
LS# 21 Aug.31-Sept.5 '68 ,(BBC-CAE Kept.) 
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Bonin Petrel Population estimate ———— 500?000 (adults) 
- Banded -*—*-- 200 (adults) 
Returned -— -*—---------- None • 
Specimens collected -—*—■-- 2 
This species was by far the most numerous bird on the island. At 
dusk immense clouds of these petrels swarmed over the island. The 
population estimate given above can have no real validity but merely 
attempts to compare the relative abundance of Bonin Petrels with numbers 
1 observed in Marche 1965. It is not at all improbable that three or four 
' times as many birds may have been present on the island. 
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None of the burrows examined had eggs or young* Most burrows, in 
fact, were being excavated. We noted that these petrels dug both by 
using right and left foot alternately and by using both feet simultan- 
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Lf# 22 Mar.20-21, '68 (RBC Rept,) 
Bonin Petrel 
Estimated population 
* 800,000 
• j 
These petrels were extremely abundant and had burrows throughout the 
Interior of the island® I checked no burrows but have no doubt that many 
were breeding. / 
