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>Map >Satellite Lying some 400 meters (1,300 feet) offshore, this is one of the major sea bird breeding grounds on the north coast. Among the birds that breed here are the fork-tailed and Leach's petrel, Oceanodroma furcata and Oceanodroma leucorhoa, pigeon guillemot, Cepphus columba, Western gull, Larus occidentalis, pelagic cormorant, Phalacrocorax pelagicus, and the black oyster-catcher, Haematopus bachmani. With approximately 5,000 breeding pairs of Leach's petrel, this is the largest colony in California. It is also one of the largest breeding colonies in the State of the fork-tailed petrel.
Vegetation is coastal scrub and grassland.
This is the type locality of the rare snail, Manadenia fidelis trinidadensis, which is known only from this island and nearby rocks. It is found in the grass or in natural crevices.
Integrity: There is some disturbance due to the rock's accessibility.
Use: Research, observational. There should be no disturbances during the breeding season.
Ref: Osborne, Timothy, 1962. Ecology and Avian Use of the Coastal Rocks of Northern California. M.A. Thesis, unpub. Humboldt State University, 215 pp.
November 1975
Inventory of California Natural Areas
Revision © 2008 Steven Louis Hartman
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