When the Synapsids Struck Back

  • Published on: 19 June 2019
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    Synapsids were the world’s first-ever terrestrial megafauna but the vast majority of these giants were doomed to extinction. However some lived on, keeping a low profile among the dinosaurs. And now our world is the way it is because of the time when the synapsids struck back.

    Thanks to Ceri Thomas for the excellent Synapsid illustration (including Bulbasaurus!)! Check out more of Ceri's paleoart at http://alphynix.tumblr.com and http://nixillustration.com

    And thanks as always to Studio 252mya for their wonderful illustrations. You can find more of their work here: https://252mya.com/

    Produced in collaboration with PBS Digital Studios: http://youtube.com/pbsdigitalstudios

    Super special thanks to the following Patreon patrons for helping make Eons possible:

    Katie Fichtner, Anthony Callaghan, Zachary Spencer, Stefan Weber, Ilya Murashov, Charles Kahle, Robert Amling, Po Foon Kwong, Larry Wilson, Merri Snaidman, Renzo Caimi Ordenes, John Vanek, Neil H. Gray, Esmeralda Rupp-Spangle, Gregory Donovan, الخليفي سلطان, Gabriel Cortez, Marcus Lejon, Robert Arévalo, Robert Hill, Todd Dittman, Betsy Radley, PS, Philip Slingerland, Jose Garcia, Eric Vonk, Tony Wamsley, Henrik Peteri, Jonathan Wright, Jon Monteiro, James Bording, Brad Nicholls, Miles Chaston, Michael McClellan, Jeff Graham, Maria Humphrey, Nathan Paskett, Connor Jensen, Daisuke Goto, Hubert Rady, Gregory Kintz, Tyson Cleary, Chandler Bass, Maly Lor, Joao Ascensao, Tsee Lee, Sarah Fritts, Alex Yan

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    References: https://docs.google.com/document/d/1YbTns-AcONtRWN9pdOZMfiqYDP5-3Hb-zt1gtDMV1Fw/edit?usp=sharing
  • Runtime : 10:55
  • dinosaurs dinos paleo paleontology scishow eons pbs pbs digital studios hank green john green complexly fossils natural history Thrinadoxon Permian Great Dying synapsid stem mammals megafauna Age of Reptiles Pangea Sauropsids temporal fenestra therapsids cynodonts burrowers mammals Carnivores herbivores dimetrodon


  • Leonard Bright
    Leonard Bright   7 hours ago

    I have a theory that monotremes arent mammals but the last branch of synapsids;

  • Kal
    Kal   16 hours ago

    Did these animals lay eggs or give live birth?

  • Mr Monstah
    Mr Monstah   4 days ago

    5:47 Bulbasaurus I KNEW IT, POKEMON ARE REAL!

  • Elenna Pointer
    Elenna Pointer   4 days ago

    Just think - the rats we see around us may be the ancestors of the next intelligent species on Earth.

  • Vincent Cournoyer
    Vincent Cournoyer   6 days ago

    Maybe our need to have a roof over our heads is connected to the habit of burrowing? Very interesting episode thank you Eons!

  • João Gabriel
    João Gabriel   1 weeks ago

    Well, is it burrowing under blankets still considered burrowing?

  • PixelDrake
    PixelDrake   1 weeks ago

    What's the name of the piece playing in the background during the opening? I like it

  • Carolina Coreas
    Carolina Coreas   1 weeks ago

    I wish I watched this video the day before my bio quiz , it would have helped me a lot.

  • Thomas Tuthill
    Thomas Tuthill   1 weeks ago

    Synapsids are 65% demon orbs, 30% water, 5% mammal.

  • Jackie Santos
    Jackie Santos   1 weeks ago

    Well yeah probably we have a little reptile inside of Us Wellston mammal or shirt

  • Ayla Williamson
    Ayla Williamson   1 weeks ago

    Can you imagine being a small lizzard chilling and this hyperactive black-eyed toothy monster comes after you like a ghost girl crawing on a ceiling?

  • Acedia Nihil
    Acedia Nihil   1 weeks ago

    Minecrafts popularity makes so much sense now.

  • thefran901
    thefran901   1 weeks ago

    Mammals to avian dinosaurs (birds): "The synapsids send their regards."

  • RayMondoART
    RayMondoART   1 weeks ago

    One of my fav episodes as I get to see many many weird "freaks" XD cotylorhynchus is weird enough but moschops? Omg

  • Undercover Hat
    Undercover Hat   2 weeks ago

    Thanks so much for your work and your enthusiasm, Kallie!! Your awesomeness is immeasurable. :)

  • Michael Crockis
    Michael Crockis   2 weeks ago

    I'm burrowing in the blanket right now while watching it. Can't lose your instincts just like that.

  • Octavio Nieto
    Octavio Nieto   2 weeks ago

    5:17 When you accidentaly open the front camera

  • Random Guy In The Comments

    3:48 ...ok lady, you're trying to tell me that's not a lizard with a tiny shark head, and a frog with a tail?

  • Richard Horsfall
    Richard Horsfall   4 weeks ago

    ..."on the cusp of the worst disaster it would ever experience"...So far.

  • roop298
    roop298   1 months ago

    Flush. I like a girl passionate about her topic.

  • ChaireFace
    ChaireFace   1 months ago

    I want to pet the evolutionary ancestors

  • Bacalhau da Noruega
    Bacalhau da Noruega   1 months ago

    It surprises me that the other order of reptiles (squamata) have evolved mammalian traits and wonder if a new branch of pseudo mammals could appear from them. Some of these synapsids certainly look a lot like our modern day lizards already so I think it would be possible.

  • ShepherdOfGrapes
    ShepherdOfGrapes   1 months ago

    Synapsids: I am your ancestorMammals: that’s not true... that’s impossible!Synapsids: search your DNA you know it to be true.

  • Kekeke89
    Kekeke89   1 months ago

    The way I learned it back in the day, Amniotes were called the first reptiles (hell, the group of amphibians that lead directly to them is are still called reptiliomorpha, not amniotomorpha), and every quadruped was considered a reptile, except for modern birds and mammals.

  • Michael Buelow
    Michael Buelow   1 months ago

    Your videos are much wider than tall. The figures of the presenters take up about 1/3 of the image. Yet, the presenters keep their elbows stuck to their ribs and all their hand gestures are in front of their bodies as if they were being recorded in a square format. This seems stiff, constricted, and contrived. Why not the occasional broad gesture? Why not relax the arms a bit?

  • Lewis Wright
    Lewis Wright   1 months ago

    3:54 - What is that green one? Its proportions are hilarious.

  • Melon Lord
    Melon Lord   1 months ago

    Me, sitting in my burrow chewing and brething at the same time. I do like those adaptions

  • Zanuth
    Zanuth   1 months ago

    Also known as Earth's "Spore" period

  • Ameha K
    Ameha K   1 months ago

    There's a Star trek novel that explains why the Permian extinction was so massive.