Attributes / relations provided by
♦ ¹Feeding ecology and niche segregation in oceanic top predators off eastern Australia, Jock W. Young, Matt J. Lansdell, Robert A. Campbell, Scott P. Cooper, Francis Juanes, Michaela A. Guest, Mar Biol (2010) 157:2347–2368
♦ ²Species- and sex-specific differences in foraging behaviour and foraging zones in blue-footed and brown boobies in the Gulf of California, Henri Weimerskirch, Scott A. Shaffer, Yann Tremblay, Daniel P. Costa, Hélène Gadenne, Akiko Kato, Yan Ropert-Coudert, Katsufumi Sato, David Aurioles, Mar Ecol Prog Ser 391: 267–278, 2009