Attributes / relations provided by
♦ ¹Diving behavior of blue-footed boobies Sula nebouxii in northern Peru in relation to sex, body size and prey type, Carlos B. Zavalaga, Silvano Benvenuti, Luigi Dall’Antonia, Steven D. Emslie, MARINE ECOLOGY PROGRESS SERIES 336: 291–303, 2007
♦ ²THE 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
♦ ³del Hoyo, J., Elliott, A., Sargatal, J., Christie, D.A. & de Juana, E. (eds.). Handbook of the Birds of the World Alive. Lynx Edicions, Barcelona.