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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
♦ ²Jackson, S. (1988). Diets of the white-chinned petrel and sooty shearwater in the southern Benguela Region, South Africa Condor 90, 20–28
♦ ³FEEDING ECOLOGY AND BODY SIZE DEPENDENCE ON DIET OF THE SOOTY SHEARWATER, PUFFINUS GRISEUS, IN THE NORTH PACIFIC, Kouzi SHIOMI and Haruo OGI, Proc. NIPR Symp. Polar Biol., 5, 105-113, 1992