Coevolution of Male and Female Genital Morphology in Waterfowl Brennan, Patricia L. R. ; Prum, Richard O. ; McCracken, Kevin G. ; Sorenson, Michael D. ; Wilson, Robert E. ; Birkhead, Tim R. Abstract Publication: PLoS ONE Pub Date: May 2007 DOI: 10.1371/journal.pone.0000418 Bibcode: 2007PLoSO...2..418B