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Description:Integrated measurement and analysis of testosterone levels, dominance hierarchy and mate attraction behavior in captive male European starlings E. The purpose of our research is to elucidate the effects of testosterone on the dominance hierarchy and mate attraction behavior in captive male European starlings Sturnus vulgaris. This means that we create novel phenotypes by manipulating the testosterone concentrations of the birds and then we compare the behavior of altered and unaltered individuals. In our study, we used two ways to manipulate the plasma concentrations of testosterone. On the one hand, we castrated starlings and on the other hand we experimentally elevated testosterone levels by giving males implants of silastic tubing, packed with testosterone.