Every once in a while, traits thought to be lost forever suddenly reappear, like a dolphin or a whale born with complete hind limbs! Known as atavisms, these occurrences can teach us all sorts of things, like how limbs actually grow. Hosted by: Hank Green SciShow has a spinoff podcast! It's called SciShow Tangents. Check it out at www.scishowtangents.org ---------- Support SciShow by becoming a patron on Patreon: www.patreon.com/scishow ---------- Huge thanks go to the following Patreon supporters for helping us keep SciShow free for everyone forever: Kevin Bealer, Jacob, Katie Marie Magnone, D.A. Noe, Charles Southerland, Eric Jensen, Christopher R Boucher, Alex Hackman, Matt Curls, Adam Brainard, Jeffrey McKishen, Scott Satovsky Jr, James Knight, Sam Buck, Chris Peters, Kevin Carpentier, Patrick D. Ashmore, Piya Shedden, Sam Lutfi, Charles George, Christoph Schwanke, Greg ---------- Looking for SciShow elsewhere on the internet? Facebook: www.facebook.com/scishow Twitter: www.twitter.com/scishow Tumblr: scishow.tumblr.com Instagram: instagram.com/thescishow ---------- Sources: Dollo’s Law/Atavisms pubmed.ncbi.nlm.nih.gov/7991619/ doi.org/10.1016/j.tree.2008.06.013 doi.org/10.1002/ajmg.a.36234 Cetacean Hind Limbs doi.org/10.1007/978-1-4899-0159-0_10 doi.org/10.1073/pnas.0602920103 doi.org/10.1046/j.1525-142X.2002.02033.x Limpet Shell Twists pubmed.ncbi.nlm.nih.gov/16701270/ doi.org/10.1098/rspb.2003.2517 Soil Mite Sex doi.org/10.1073/pnas.0700034104 doi.org/10.1002/ece3.5303 doi.org/10.1016/0305-1978(92)90056-J Big Bone Worm Males doi.org/10.1016/j.cub.2014.11.032 doi.org/10.1016/j.crvi.2008.10.007 doi.org/10.1038/s41467-017-01002-8 doi.org/10.1186/1741-7007-7-74 Images: commons.wikimedia.org/wiki/File:Anthracotherium_magnum.jpg link.springer.com/article/10.1007/s12052-009-0135-2/figures/24 link.springer.com/article/10.1007/s12052-009-0135-2/figures/2 commons.wikimedia.org/wiki/File:Trochita_trochiformis_01.JPG www.inaturalist.org/observations/19706160 www.inaturalist.org/observations/35191166 www.inaturalist.org/observations/32780129 www.inaturalist.org/observations/7073348 www.flickr.com/photos/jsjgeology/25447477923 www.flickr.com/photos/treegrow/31682185476 eol.org/media/6248881 www.flickr.com/photos/treegrow/39096881684 www.flickr.com/photos/treegrow/26010907628 www.flickr.com/photos/scrippsocean/15806618219/in/album-72157647375239253/ www.flickr.com/photos/scrippsocean/15806619019/in/album-72157647375239253/ www.flickr.com/photos/scrippsocean/15372997583/in/album-72157647375239253/

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