![Evidence of phenotypic plasticity of penis morphology and delayed reproductive maturation in response to male competition in waterfowl Evidence of phenotypic plasticity of penis morphology and delayed reproductive maturation in response to male competition in waterfowl](https://bioone.org/ContentImages/Journals/tauk/134/4/AUK-17-114.1/graphic/i0004-8038-134-4-882-f01.jpg)
Evidence of phenotypic plasticity of penis morphology and delayed reproductive maturation in response to male competition in waterfowl
![Male ducks reproductive organs can be the length of their entire body .. anyone need a wine opener? : r/Damnthatsinteresting Male ducks reproductive organs can be the length of their entire body .. anyone need a wine opener? : r/Damnthatsinteresting](https://preview.redd.it/lmykjye41yt61.jpg?auto=webp&s=cfcd2a2022e796af4515ecbbeb2dc8b0070ca03f)
Male ducks reproductive organs can be the length of their entire body .. anyone need a wine opener? : r/Damnthatsinteresting
![Photograph of the 42.5-cm penis of a male Argentine lake duck (Oxyura... | Download Scientific Diagram Photograph of the 42.5-cm penis of a male Argentine lake duck (Oxyura... | Download Scientific Diagram](https://i1.rgstatic.net/publication/232780092_Nitrogen_fixation_Endocrine_disrupters_and_flavonoid_signalling/links/00b4951fc136ad9b76000000/largepreview.png)