BULWER'S PETREL 
Annotated List 
EEHOA 
Dec. 9 - 16 , 1961 
(Kramer) 
June 10, 1962 
(Kramer & B) 
March 6-7,1964 
(Amerson, POBSP) 
(Walker) 
July 2%, 1.96h 
(Kridler) 
Sept. 23- 2 4,1964 
(Fleet, POBSP) 
(Kridler) 
hone seen. 
Done mentioned in report. [Common "Common, on eggs" in referecnce 
to Bonin Petrel may refer to this species.] 
hone mentioned in report, 
hone mentioned in field notes 
Bulwer Petrels were very abundant and many nests were found in the 
small holes in the rocks. These contained eggs and newly hatched 
young. 
Estimated total population-1,500 
Remarks t 111 over ship at night 
Were to be found in the rocks, small holes in the rocks throughout 
the island, and several almost full grown chicks were found. An 
estimated population of 1,500 was thought to be using the island but this estimate 
may be low. ... I might add that we banded five Bulwer*s Petrels, all of them 
locals. 
March 13-14,1965 
(Banko, POBSP) 
(Kridler) 
Estimated total island population 
Breeding : Wo eggs or young seen 
Banded- 1 Done 
: 100 
One was seen at sea shortly before sighting the island and later on 
one was found on the island. 
July 28- Estimated number--- 100,000 + 10 fo 
August 1, 1966 Dumber of nests - 15,000 ± 25 % 
(Heiden, POBSP) Dumber of young- 5? 000 ± 50 1o 
Age of young-0-10 days — 100 <jo 
Banded - 800 adults 
Population in breeding status, distributed over entire island. 
Most breeding birds on well-developed eggs or 0-10 day old nestlings. 
Nest sites were primarily crevices in rock ledges, although eggs were 
occasionally found in shallow depressions under dense vegetation. 
Considerable courtship and fighting behavior was demonstrated by non¬ 
incubating birds, and pairs of birds were commonly found in the same 
crevice or hole. 
March 8 - 9,1967 
(Hackman, POBSP) 
(Sefft) Population estimate: k + adults courting... lards wre paxreu 
in burrows and were quite vocal. These birds gave an unfamiliar (to 
this observer) call that was quite unlike the coo-coo-coo call that is normally heard 
in the 
