Lays egg in small crevice on cliff face, talus slope, grassy slope with rocky outcrops, on cobble-boulder beach (USFWS 2006a), or on lava flows on high slopes (AOU 1983).
AOU. 1983. Check-list of North American birds. 6th ed.American Ornithologists’ Union, Washington D. C.
USFWS. 2006a. Alaska Seabird Information Series (ASIS) Draft report. Compiled by Lynn Denlinger. USFWS, Migratory Bird Management, Nongame Program, Anchorage, AK. Available online at: http://alaska.fws.gov/mbsp/mbm/seabirds/species.htm.