This movie shows the pulsating of the cloaca of a receptive female, which occurs at a rate of approximately 40 contractions/min. She holds her tail high to facilitate copulation. The male is threading on her back and the build up of lymph prior to penis eversion can be seen. This research features in the paper 'Explosive eversion and functional morphology of the duck penis supports sexual conflict in waterfowl genitalia' published in Proceedings of the Royal Society B.
Link to this comment:
All Comments (0)