Argentine Lake Ducks
With a reproductive organ as long as yourself, one would believe that all his ducks would be in a row. Unfortunately, for this duck, there exist very limited pair-bonding with the females who are often resistant. Her resistance may result in rape, as she struggles to get away during copulation, but due to complexities in her oviduct, she may not get pregnant. The elaborate displays performed by the ducks are in an effort to court the females. The fully erected penis is enclosed with coarse spines and has a soft brush-like tip which is used to brush away previously deposited sperm. Despite their small stature, the males have the longest penis of any bird species worldwide. Lucky Duck!