Male preference for female foot colour in the socially monogamous blue-footed booby, Sula nebouxii

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The evolution of mutual ornamentation (2007, background): “Many ornaments are prominently displayed both before and after pair formation, but their function during the latter stage is poorly understood (Torres & Velando 2005).”
Lonely hearts or sex in the city? Density-dependent effects in mating systems (2006, background): “…we are not aware of any comparative studies testing this prediction, it is perhaps no coincidence that many studies on mutual mate choice are conducted in large seabird colonies ( Jones & Hunter 1993; Velando et al. 2001; Childress & Bennun 2002; Daunt et al. 2003; Torres & Velando 2003, 2005).”
Sexual selection in females (2009, background): “…where females are ornamented or brightly coloured, males commonly show a preference for brighter or more highly ornamented females (Berglund et al. 1997; LeBas & Marshall 2000; Amundsen & Forsgren 2001; Domb & Pagel 2001; Berglund & Rosenqvist 2003; Torres & Velando 2005; Griggio et al. 2005).”
Female American goldfinches use carotenoid-based bill coloration to signal status (2009, background): “Recent theoretical interest in female ornaments has resulted in studies showing that female traits indicate phenotypic or genetic quality, and that those traits are assessed by males during mate choice (Amundsen et al. 1997; Torres and Velando 2005; Amundsen and Pärn 2006).”