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 were present. A few adult Double-crested Cormorants in breeding plumage were seen on North Island, but no evidence of nesting was noted there. Several large flocks (50+) were present on Center Island and a breeding population is 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 territorial fighting was noted and copulation between members of pairs was frequent. Several hundred new nest scrapes, semi-completed and completed nests were noted. About 50 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.