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Non-breeding gonadal testosterone production of male and female Northern Cardinals (Cardinalis cardinalis) following GnRH challenge. General and comparative endocrinology 174:370-378.DeVries MS, Holbrook AL, Winters CP, Jawor JM (2011) Non-breeding gonadal testosterone production of male and female ...
Over 3 years, we compared a comprehensive suite of visual signals in male and female Northern Cardinals (Cardinalis cardinalis) in a rural and an urban population. We predicted that urban birds would have enhanced carotenoid-based signals as they likely have access to more carotenoids from ...