Brown Booby 
(Sula leucogaster) 
Current Status : Breeds annually. 
Prior Records : Munro (l94l) saw this species, off Nihoa, May 26-27, 1891* 
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Labrecque (1957) reported two dozen following tne-ir/tas passed Nihoa on 
July 4, 1957- Other records are Fisher (190.6), Wetmore (1923), Vanderbilt^^i^»^<^ci^ 
(19^1), Kramer (1961), Kramer and Beardsley (1962). 
Population : Wetmore (op. cit.) estimated 50 pairs June 11-16, 1923. Vander¬ 
bilt and jk Schauensee (op. cit.) observed a "number" on the plateau* August 
7-15j 1940. Kramer (op. cit.) considered them to be "relatively rare" 
December 11-15, 1961, and Kramer and Beardsley (op. cit.) recorded them as 
present on June 10, 1962. 
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POBSP %r±p of June 5 and 6, 1963 saw 40 birds but no landing was made. 
On March 6, 1964, 175 birds were estimated and 150 birds were estimated on 
March 24, 1964. The trip of September 23-24, 1964 estimated 20 birds. 
Reproduction : Fisher (op. cit.) states that this species "breeds on Bird 
Island#, and prefers the brink of the escarpment of rock on the south side". 
On August 5-10, 1902 he saw "a number” of immatures. Wetmore (op. cit.) 
reported 50 nesting pairs, one nest with two eggs and the remainder with 
nestlings, June 11-16, 1923* He found most of the nests open ledges 
above the cliffs. Vanderbilt and j^e Schauensee (op. cit.) reported large 
nestlings on the plateau, August 7-15> 1940. Kramer (op. cit.) reported 
nests with eggs December 5”10, 1961 and Kramer and Beardsley (op. cit.) 
reported large, downy nestlings on June 10, 1962. 
0** ^e POBSP visit of March 6, 1964 counted 74 nests with eggs and one 
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large nestling^ The t&4rp of March 24, 1965 reported both eggs and nestlings. 
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The September 23-24, 1964 counted four immature birds. With eggs 
reported in March, June and December it is impossible accurately to define 
the Nihoa breeding cycle. 
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