Reviewer #1's Review
“This ms reports on a very interesting discovery of complexity in the genital morphology of female waterfowl, and provides convincing evidence that this complexity is correlated with male penis size and the incidence of forced copulations across species. This study is important because it is the first report of interspecific variation in female genital complexity in the vertebrates-there is considerable evidence in the invertebrates-and one of the few studies to show a correlation between male and female genital complexity, suggesting that this complexity has been the result of intersexual antagonistic coevolution (or sexual conflict). This is a first-rate study that would be acceptable in a front-line journal of evolutionary/behavioural ecology.”
n.b. These are the general comments made by the reviewer when reviewing this paper. Specific points addressed during revision of the paper are not shown.
