How the Walrus Got Its Tusks

PBS Member Stations rely on viewers like you. To support your local station, go to http://to.pbs.org/DonateEons ↓ More info below ↓ The rise and fall of ancient walruses, and how modern ones got their tusks, is a story that spans almost 20 million years. And while there are parts of the story that we’re still trying to figure out, it looks like tusks didn’t have anything to do with how or what these animals ate. Thank you to these paleoartists for allowing us to use their wonderful illustrations: Ceri Thomas:   / alphynix   Fabrizio de Rossi:   / artoffabricious   Stanton Fink: https://www.deviantart.com/avancna This video features this paleogeographic map: Scotese, C.R., 2019. Plate Tectonics, Paleogeography, and Ice Ages, YouTube video:    • Scotese Plate Tectonics Paleogeography & I...  . Produced in collaboration with PBS Digital Studios:    / pbsdigitalstudios   Super special thanks to the following Patreon patrons for helping make Eons possible: Anthony Callaghan, Heathe Kyle Yeakley, Anton Bryl, Jeff Graham, Shelley Floryd, Laura Sanborn, Henrik Peteri, Zachary Spencer, Chandler Bass, Joao Ascensao, Andrey, Ben Thorson, Marcus Lejon, Ilya Murashov, Jerrit Erickson, Merri Snaidman, David Sewall, Leonid, Gabriel Cortez, Jack Arbuckle, Robert Noah, Philip Slingerland, Todd Dittman, Ben Cooper, James Bording, Eric Vonk, Robert Arévalo, Esmeralda Rupp-Spangle, Jon Monteiro, Missy Elliott Smith, Jonathan Wright, Gregory Donovan, Miles Chaston, Michael McClellan, PS, Brad, Maria Humphrey, Larry Wilson, Hubert Rady, John Vanek, Tsee Lee, Daisuke Goto, Gregory Kintz, Matt Parker, Tyson Cleary, Case Hill, Stefan Weber, Betsy Radley If you'd like to support the channel, head over to   / eons   and pledge for some cool rewards! Want to follow Eons elsewhere on the internet? Facebook -   / eonsshow   Twitter -   / eonsshow   Instagram -   / eonsshow   References: https://docs.google.com/document/d/1q...