Contact: Janet Rettig Emanuel
janet.emanuel@yale.edu
203-432-2157
Yale University

Mallard Oviduct and Phallus

Caption: Evolution of convolutions in the Mallard oviduct (below) and phallus (above) may give the female duck an anatomical means of controlling who fathers their offspring. Bar measure = 2cm.

Credit: Courtesy of Patricia Brennan

Usage Restrictions: with credit given

Related news release: 'War Between the Sexes': The coevolution of genitalia in waterfowl