Sexual selection: Are ducks impressed by drakes' display?

@article{McCracken2001SexualSA,
  title={Sexual selection: Are ducks impressed by drakes' display?},
  author={Kevin G. McCracken and Robert E. Wilson and Pamela J. McCracken and Kevin P. Johnson},
  journal={Nature},
  year={2001},
  volume={413},
  pages={128-128}
}
Surprisingly few birds have penises, but among those that do, the Argentine lake duck (Oxyura vittata) tops the bill — the penis of this small stifftail duck from South America is shaped like a corkscrew and, at almost half a metre long, is the largest of any bird measured so far. Factors responsible for the evolution of this remarkable organ could include runaway selection, whereby drakes with longer penises gain dominance and copulate with more females, or preference by females for drakes… 
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References

SHOWING 1-5 OF 5 REFERENCES
Conservation biology: Ducks and darkes
  • C. Mead
  • Environmental Science
    Nature
  • 2000
TLDR
It turns out that males of a third species have an especially large penis: a speculative answer is that female white-headed ducks might favour similarly well-endowed males.
Sexual selection and the intromittent organ of birds
TLDR
It is suggested that male IOs may have largely disappeared in birds because of female preference for males without IOs (Female Choice Hypothesis), thereby allowing females more control over fertilisation and the small number of independent evolutionary losses of IOs in birds precludes rigorous statistical tests of these hypotheses.
The 20-cm Spiny Penis of the Argentine Lake Duck (Oxyura vittata)
TLDR
This paper aims to demonstrate the efforts towards in-situ applicability of EMMARM, as to provide real-time information about how the water quality of the Guaymas Channel changes during the summer months of June and July of each year.
Sperm competition in birds : evolutionary causes and consequences
Birds as vehicles for sperm competition avian mating systems and sperm competition male and female reproductive systems and the fertile period sperm precedence and mechanisms of sperm competition