2 . 
Nestsites were invariably in deep recesses under large boulders 
which rendered investigation impossible in most cases. The few (ca. 
five) which could be dug out were without eggs. In all burrows 
investigated, both birds were within the nest chamber. Occasional large 
boulders harbored more than one pair. 
Specimens collected in the field either had bare or rapidly de- 
feathering brood patches, but egg laying had apparently not yet begun. 
Both Bent (Life Histories of North American Birds) and Palmer (Handbook 
of North American Birds) give 30 May as the earliest egg records. 
A population estimate was not attempted on North Island since we 
only worked the cove area on the south side of the island at night. It 
is not known whether concentrations were equally distributed over the 
rest of the island. 
Pelecanus occidentalis californicus Brown Pelican 
About 20 birds were observed feeding or flying about the cove on 
the south side. Immatures and adults were present in about equal numbers. 
Old nests were numerous along the high rocky area above the south cove, 
but none was active at- this time. Two old nests were being utilized 
by Western Gulls. 
Cormorants 
Probably both Double-crested and Brandt’s Cormorants 
A few adult Double-crested Cormorants in breeding plumage 
North Island, but no evidence of nesting was noted there, 
flocks (50+) were present on Center Island and a breeding 
likely present there. 
Larus occidentalis wymani Western Gull 
This was probably the most numerous breeding species on the island 
(storm petrel numbers ??) with an estimated 10,000 birds. Nestsites 
were found over the island in all types of habitat. Considerable terri¬ 
torial fighting was noted and copulation between members of pairs was 
frequent. Several hundred new nest scrapes, semi-completed and completed 
nests were noted. About 5° nests were recorded with one egg, 20 nests 
with two eggs, and 10 with complete clutches of three eggs. This was 
not a complete island survey, but a survey restricted to the high central 
ridge and the south slope. No immature birds were seen about the island. 
Larus Philadelphia Bonaparte’s Gull 
About 80-100 birds (both adults and immatures) were seen offshore 
North Island feeding with Western Gulls and a few Brown Pelicans. 
were present, 
were seen on 
Several large 
population is 
