Attributes / relations provided by
♦ ¹Food Web Relationships of Northern Puget Sound and the Strait of Juan de Fuca : a Synthesis of the Available Knowledge, Charles A. Simenstad, Bruce S. Miller, Carl F. Nyblade, Kathleen Thornburgh, and Lewis J. Bledsoe, EPA-600 7-29-259 September 1979
♦ ²Breeding ecology of Horned Puffins (Fratercula corniculata) in Alaska: annual variation and effects of El Niño, A.M.A. Harding, J.F. Piatt, and K.C. Hamer, Can. J. Zool. 81: 1004–1013 (2003)
♦ ³An estimate of summer food consumption of six seabird species in Iceland, K. Lilliendahl and J. Solmundsson, ICES Journal of Marine Science, 54: 624–630. 1997