![Maris Wicks on Twitter: "#mermay : barnacle edition: part two Fun fact: Barnacles have the largest penis to body size ratio in the animal kingdom. https://t.co/qPODnwSRkL" / Twitter Maris Wicks on Twitter: "#mermay : barnacle edition: part two Fun fact: Barnacles have the largest penis to body size ratio in the animal kingdom. https://t.co/qPODnwSRkL" / Twitter](https://pbs.twimg.com/media/DeiU8kIXkAArjzJ.jpg:large)
Maris Wicks on Twitter: "#mermay : barnacle edition: part two Fun fact: Barnacles have the largest penis to body size ratio in the animal kingdom. https://t.co/qPODnwSRkL" / Twitter
![To facilitate genetic transfer between isolated individuals, barnacles have extraordinarily long penises. Barnacles probably have the largest penis to body size ratio of the animal kingdom." : r/pics To facilitate genetic transfer between isolated individuals, barnacles have extraordinarily long penises. Barnacles probably have the largest penis to body size ratio of the animal kingdom." : r/pics](https://external-preview.redd.it/btgM0Q-y3f4Zq0eueyAg4mPVtx_7pB9sFvhR0tBHOMs.jpg?auto=webp&s=8090457968d0084ed916fd958f7e84f13d37fb4a)
To facilitate genetic transfer between isolated individuals, barnacles have extraordinarily long penises. Barnacles probably have the largest penis to body size ratio of the animal kingdom." : r/pics
![Acorn barnacles have the longest penises (relative to body size) of any animal - they can extend to over 6 times the length of the body. Adults are hermaphrodites but they can't Acorn barnacles have the longest penises (relative to body size) of any animal - they can extend to over 6 times the length of the body. Adults are hermaphrodites but they can't](https://external-preview.redd.it/afOizlPMjNh3HZvcpYc6EFqk2U68325UAYntfcWpc5M.png?format=pjpg&auto=webp&s=f8dbdadeaf3426f37b40372caf8bc2577b620911)
Acorn barnacles have the longest penises (relative to body size) of any animal - they can extend to over 6 times the length of the body. Adults are hermaphrodites but they can't
![Precisely proportioned: intertidal barnacles alter penis form to suit coastal wave action | Proceedings of the Royal Society B: Biological Sciences Precisely proportioned: intertidal barnacles alter penis form to suit coastal wave action | Proceedings of the Royal Society B: Biological Sciences](https://royalsocietypublishing.org/cms/asset/7dd548fe-9bfd-4933-8c6c-eb127efd342f/1081fig5.jpg)
Precisely proportioned: intertidal barnacles alter penis form to suit coastal wave action | Proceedings of the Royal Society B: Biological Sciences
![Anna Rothschild on Twitter: "@NerdyAndQuirky @TheTierZoo @sallylepage @SimoneGiertz Many years ago I made a short video barnacle penises, and let me tell you, they are even weirder than you could imagine: https://t.co/jCsr36i6wS" / Anna Rothschild on Twitter: "@NerdyAndQuirky @TheTierZoo @sallylepage @SimoneGiertz Many years ago I made a short video barnacle penises, and let me tell you, they are even weirder than you could imagine: https://t.co/jCsr36i6wS" /](https://pbs.twimg.com/media/Ds82-h8U4AAUyTw.jpg)
Anna Rothschild on Twitter: "@NerdyAndQuirky @TheTierZoo @sallylepage @SimoneGiertz Many years ago I made a short video barnacle penises, and let me tell you, they are even weirder than you could imagine: https://t.co/jCsr36i6wS" /
![1 Reproductive behaviour of barnacles. In some species the penis length... | Download Scientific Diagram 1 Reproductive behaviour of barnacles. In some species the penis length... | Download Scientific Diagram](https://www.researchgate.net/publication/282700669/figure/fig1/AS:395312012251136@1471261136246/Reproductive-behaviour-of-barnacles-In-some-species-the-penis-length-of-barnacles-can.png)