Competing females and caring males. Sex steroids in African black coucals, Centropus grillii

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Effects of blood collection on wild birds: an update (2008, background): “Additionally, very little is known about the effects of blood sampling on tropical birds (Goymann and Wingfield 2004), with no reports on neotropical birds.”
Testosterone response to GnRH in a female songbird varies with stage of reproduction: implications for adult behaviour and maternal effects (2007, methodology): “Although previous studies in which females were challenged with GnRH have not found significant increases in T (Wingfield et al. 1991; Goymann & Wingfield 2004; Spinney et al. 2006), our study is the first to assess variation across multiple stages of the breeding season.”
Sociable schedules: interplay between avian seasonal and social behaviour (2006, background): “It is not clear whether results can be generalized to species in which females take the lead in competition for mates and territories (e.g. Wingfield & Silverin 2002; Goymann & Wingfield 2004b).”
Sexual selection in females (2009, background): “Several studies have investigated whether females show elevated testosterone levels in polyandrous species but there is little evidence that they do so (Fivizzani & Oring 1986; Eens & Pinxten 2000; Goymann & Wingfield 2004; Voigt & Goymann 2007).”