Multiple sexual advertisements honestly reflect health status in peacocks (Pavo cristatus)

By A. Loyau, M. Saint Jalme, C. Cagniant, G. Sorci. Behavioral Ecology and Sociobiology, 2005

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Iridescent structurally based coloration of eyespots correlates with mating success in the peacock (2007, methodology): “The peacock train is thought to be costly to produce and maintain (Petrie et al. 1991), and the eyespot number has been shown to be an honest indicator of male health status and ability to cope with an immune challenge ( Loyau, Saint Jalme, Cagniant, and Sorci 2005 ).”
Peahens do not prefer peacocks with more elaborate trains (2008, background): “…analyses have frequently included measures of trains taken from 2- or 3-year-old males with regard to male mating success and territory acquisition (Petrie et al. 1991; Loyau et al. 2005a), condition dependency (Petrie et al. 1996; Møller & Petrie 2002), or immunocompetence (Møller & Petrie 2002).”