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Bulwe-r’s Petrel ( Bulweria bulwerii ) 
Current status : Breeds annually* 
Prior Records ; Fisher ( 1906 ) said this species flew on hoard, ship on the night 
of June 2, 1902. Other records are Wetmore (I 923 ), and Vanderbilt 
and Jfe Schauensee (1941). 
population: Wetmore (op. cit) reported, this species as abundant June 11-16, 
1923 and Vanderbilt and*$k Schauensee (op. cit) reported them 
as "extremely common" August 7-16, 1940. 
The POBSP trip of June 5- 6 , 1963; although unable to land, saw 
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thousands. The 4r±p of September 23-24, 1964 estimated that 1500 
of these birds came on board the ship the night of the 23 rd but only 
one bird was found on the island during the day. One hundred were 
estimated present on March 24, 1965 . 
Reproduction : This species prefers to nest under cover especially rocks (POBSP). 
The volcanic rock substrate of Nihoa offers ideal habitat for these 
birds. 
Wetmore (op. cit) found them incubating eggs in June 11-16, 1924. 
Vanderbilt and ife Schauensee (op. cit) found that all nests examined 
during August 7-l£ 1940, contained downy nestlings. Pre-breedings 
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population increase is indicated by the POBSP visits. The 4>r4p of 
March 6, 1964 did not see any of this species. The of March 
24, 1965 reported 100 birds. 
suRver 'PRRty 
The t - r - i p of September 23 and 24, 1964 found 25 dead immature 
birds. 
Other Specimens : . Phila. Academy l46l60, cf, August 1940; Phila Academy l46l6l, 
V, August 1940; Phila. Academy 146168, cf, August 1940; Phila. 
Academy 146169, c 1, August 19 I+O; ^USNM 3 OO 799 , c 1, 15 June 1923^ 
