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♦ ¹Diet of the Humboldt penguin (Spheniscus humboldti) in northern and southern Chile, C. Herling, B. M. Culik, J. C. Hennicke, Marine Biology (2005) 147: 13–25
♦ ²Diet of Neotropic cormorant (Phalacrocorax brasilianus) in an estuarine environment, V. Barquete, L. Bugoni, C. M. Vooren, Mar Biol (2008) 153:431–443
♦ ³THE PREDATION OF GUANO BIRDS ON THE PERUVIAN ANCHOVY (Engraulis ringens JENYNS), Romulo Jordán, CALIFORNIA COOPERATIVE OCEANIC FISHERIES INVESTIGATIONS, REPORTS VOLUME XI, 1 JULY 1963 TO 30 JUNE 1966, p. 105-109