We may never know when our ancestors walked out of the water into dry land. But it's possible they may have been walking in water for millions of years! Hosted by: Hank Green SciShow is on TikTok! Check us out at https://www.tiktok.com/@scishow ---------- 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: Bryan Cloer, Chris Peters, Matt Curls, Kevin Bealer, Jeffrey Mckishen, Jacob, Christopher R Boucher, Nazara, charles george, Christoph Schwanke, Ash, Silas Emrys, Eric Jensen, Adam Brainard, Piya Shedden, Alex Hackman, James Knight, GrowingViolet, Sam Lutfi, Alisa Sherbow, Jason A Saslow, Dr. Melvin Sanicas, Melida Williams, Tom Mosner ---------- Looking for SciShow elsewhere on the internet? SciShow Tangents Podcast: http://www.scishowtangents.org/ Facebook: http://www.facebook.com/scishow Twitter: http://www.twitter.com/scishow Instagram: http://instagram.com/thescishow ---------- Sources: https://www.cell.com/cell/fulltext/S0092-8674(18)30050-3 https://bioone.org/journals/copeia/volume-2003/issue-3/CG-02-153R1/Punting--An-Unusual-Mode-of-Locomotion-in-the-Little/10.1643/CG-02-153R1.short https://royalsocietypublishing.org/doi/abs/10.1098/rstb.1993.0007 https://royalsocietypublishing.org/doi/full/10.1098/rsif.2020.0701 https://www.seas.harvard.edu/news/2021/03/ancient-vertebrates-had-everything-they-needed-walk-underwater-millions-years https://www.sciencedirect.com/science/article/abs/pii/S0944200617302052 https://onlinelibrary.wiley.com/doi/abs/10.1002/jmor.10865 Images https://www.storyblocks.com/video/stock/fish-chub-swimming-in-the-aquarium-hrik9al3pkik77cft https://www.storyblocks.com/video/stock/young-female-with-retriever-dog-walking-leisurely-on-the-path-at-sunset-r_qfvxo98ka3yan53 https://www.storyblocks.com/video/stock/multicoloured-koi-fish-swimming-graceful-in-a-water-of-an-garden-colorful-koi-fish-in-the-pond-with-dark-coloured-ground-moving-around-saz2atdjwj2aldr3u https://www.storyblocks.com/video/stock/flat-fish-lying-on-the-bottom-and-trying-to-merge-with-the-mud-b3t53aeork17ww9iy https://www.storyblocks.com/video/stock/4k-dog-running-up-driveway-gimbal-shot-sej0rxo9xizy9a7pu https://www.shutterstock.com/image-vector/structure-motor-neuron-impulses-transmitted-through-423991636 https://www.istockphoto.com/photo/skate-fish-gm185275955-19891926 https://commons.wikimedia.org/wiki/File:Heliobatis_radians_Green_River_Formation_(cropped).jpg https://www.istockphoto.com/photo/modern-hospital-physical-therapy-patient-with-injury-walks-on-treadmill-wearing-gm1335020216-416920392 https://commons.wikimedia.org/wiki/File:Valkyrie-robot-3.jpg