SciShow: Why Did the Rooster Lose Its Penis?

Teacher or professor: SciShow
Subject: Science
Content of the Lesson: Why did so many birds ditch penises? Maybe it was natural or sexual selection, an accident, or in exchange for something way more useful to them. Whatever the reason, penis loss goes to show that internal fertilization doesn’t require a penis. Hosted by: Michael Aranda SciShow has a spinoff podcast! It's called SciShow Tangents. Check it out at http://www.scishowtangents.org ---------- Support SciShow by becoming a patron on Patreon: https://www.patreon.com/scishow ---------- Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever: Bd_Tmprd, Jeffrey Mckishen, James Knight, Christoph Schwanke, Jacob, Matt Curls, Sam Buck, Christopher R Boucher, Eric Jensen, Lehel Kovacs, Adam Brainard, Greg, Sam Lutfi, Piya Shedden, Katie Marie Magnone, Scott Satovsky Jr, Charles Southerland, Charles george, Alex Hackman, Chris Peters, Kevin Bealer ---------- Looking for SciShow elsewhere on the internet? Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Tumblr: http://scishow.tumblr.com Instagram: http://instagram.com/thescishow ---------- Sources: https://doi.org/10.1016/j.cub.2013.04.062 https://doi.org/10.1126/science.1224301 https://pubmed.ncbi.nlm.nih.gov/27549197/ https://doi.org/10.1098/rsbl.2015.0694 https://doi.org/10.1098/rsbl.2004.0161 https://doi.org/10.1159/000365771 https://doi.org/10.1201/b10750-4 https://doi.org/10.1093/auk/117.3.820 https://doi.org/10.1016/0300-9629(91)90122-S https://doi.org/10.2307/3677097 https://doi.org/10.1007/s00429-003-0358-x https://pubmed.ncbi.nlm.nih.gov/20961376/ https://doi.org/10.1098/rstb.1993.0044 https://pubmed.ncbi.nlm.nih.gov/17476339/ https://doi.org/10.1093/beheco/arh039 https://doi.org/10.1093/auk/119.2.403 https://pubmed.ncbi.nlm.nih.gov/23140989/ https://doi.org/10.1016/j.devcel.2015.09.003 https://doi.org/10.1073/pnas.0702207104 Images: https://www.youtube.com/watch?v=rT3HoJJA_kg https://en.wikipedia.org/wiki/File:Rattlesnake_Hemipenes.jpg https://commons.wikimedia.org/wiki/File:Europasaurus_holgeri_Scene_2.jpg


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