![]() Another big difference: Forced copulations are not unusual and often lead to serious complications in the females - even death, for example due to drowning. What you don't see: In contrast to most other birds, drakes push a penis out of their cloaca during sexual intercourse. Not so with ducks: the drake mounts the female and presses it under water. Males and females press their common body exit for urine, intestine and reproduction against each other, whereby the sperm get into the cloaca of the female. In most birds, the sexual act consists of a cloaca kiss. ![]() This suggests that the ducks´ evolutionary arms race with forced copulations on one side and anatomical countermeasures on the other cannot continue without restrictions.ĭucks: vaginal intercourse instead of cloaca kiss The opposite actually seems to be the case: penis length and egg size correlate negatively, the larger the drake´s penis, the smaller the duck eggs. A current study led by the Konrad Lorenz Institute of Ethology at the University of Veterinary Medicine Vienna has now been able to refute this hypothesis. ![]() : Until now, the going assumption for ducks (Anatidae) was "large penis, forced copulation, large eggs". Students’ union membership fee and tuition fee.University entrance qualification examination.Offer for schools and educational counsellors.Master’s Programme in Precision Animal Health.Master's Programme in Evolutionary Systems Biology.Master's Programme Wildlife Ecology and Wildlife Management.Master's Programme in Precision Animal Health.Interdisciplinary Master's Programme in Human-Animal Interactions.Master’s Programme in Comparative Biomedicine.Bachelor's Programme in Equine Sciences.Bachelor's Programme in Biomedicine and Biotechnology.Diploma Programme in Veterinary Medicine. ![]()
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |