SciShow is supported by Brilliant.org. Go to Brilliant.org/SciShow to get 20% off of an annual Premium subscription. Prehistoric teeth prove that hyenas once roamed the Arctic and the relationship between ancient crocodiles and climate is more complicated than we thought. 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: Adam Brainard, Greg, Alex Hackman, Sam Lutfi, D.A. Noe, الخليفي سلطان, Piya Shedden, KatieMarie Magnone, Scott Satovsky Jr, Charles Southerland, Patrick D. Ashmore, charles george, Kevin Bealer, Chris Peters ---------- 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: Arctic Hyenas dx.doi.org/10.5334/oq.64 www.eurekalert.org/emb_releases/2019-06/uab-ftr061119.php www.sciencedirect.com/science/article/pii/S1055790305003623 trove.nla.gov.au/version/24838239 www.nps.gov/articles/beringiamegafauna.htm cdn.elifesciences.org/articles/34773/elife-34773-v1.pdf Croc Climate Clocks dx.doi.org/10.1080/02724634.2019.1617723 www.eurekalert.org/emb_releases/2019-06/tfg-ccc061419.php www.sciencedirect.com/science/article/pii/S0031018297001089 www.nature.com/articles/ncomms9438 www.palaeogeography.net/uploads/1/0/0/8/100869804/markwick_2007.pdf www.researchgate.net/publication/285634246_The_Eocene-Oligocene_Transition www.sciencedirect.com/science/article/pii/S0031018211001805 ------ Images: www.istockphoto.com/photo/spotted-hyenas-in-the-wilderness-of-africa-gm1064310770-284577685 www.istockphoto.com/photo/brown-hyena-gm512962341-47079548 www.istockphoto.com/photo/striped-hyena-on-a-morning-walk-gm857719388-141483243 www.istockphoto.com/photo/aardwolf-gm538361188-95721391 www.istockphoto.com/photo/spotted-hyena-gm923784292-253562175 www.istockphoto.com/photo/north-pole-3d-render-planet-earth-gm691853736-127612845 en.wikipedia.org/wiki/File:Beringia_land_bridge-noaagov.gif www.eurekalert.org/multimedia/res/203324.php?from=432456 www.eurekalert.org/multimedia/res/203325.php?from=432456 www.istockphoto.com/photo/argentina-patagonia-glacier-perito-moreno-national-park-gm155144198-18407694 www.eurekalert.org/multimedia/res/203323.php?from=432456 www.istockphoto.com/photo/short-faced-bear-gm1133043533-300609780 www.istockphoto.com/photo/small-crocodile-close-up-gm1002498262-270908440 www.istockphoto.com/photo/adult-alligator-sunning-on-a-log-gm1014432226-273082571 commons.wikimedia.org/wiki/File:Hesperosuchus_flipped.jpg commons.wikimedia.org/wiki/File:Oligocene.jpg www.videoblocks.com/video/crocodile-alligator-on-an-ox-sksmm2j www.videoblocks.com/video/alligators-slumbering-in-the-shade-on-a-sandy-river-bank-camera-movement-filmed-from-a-boat-and-pull-focus-moving-between-foreground-and-background-animals-includes-original-audio-fh-6bgu www.videoblocks.com/video/a-captive-long-nosed-gavialidae-crocodile-basking-motionless-by-the-banks-of-a-still-pond-in-the-heat-of-the-indian-sun-d8q6me5 www.videoblocks.com/video/group-of-friends-looking-at-a-tablet-pc-watching-sports-game-cheering-together-bfaz8h-bipk0tq03 www.istockphoto.com/photo/a-beautiful-day-in-the-woods-between-cold-and-snow-gm1033090626-276678137 www.istockphoto.com/photo/spotted-hyena-isolated-gm451043463-25076582 www.istockphoto.com/photo/spotted-hyena-isolated-gm451043467-25076588 www.istockphoto.com/photo/spotted-hyena-on-white-gm509493994-85813285

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