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
♦ ²Distribution and foraging behaviour of the Peruvian Booby (Sula variegata) off northern Chile, Katrin Ludynia, Stefan Garthe, Guillermo Luna-Jorquera, Journal of Ornithology (2010) 151:103–111