When the Synapsids Struck Back



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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 and

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

Produced in collaboration with PBS Digital Studios:

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source: https://ultra-dark-radio.com

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37 thoughts on “When the Synapsids Struck Back”

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

  2. 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?

  3. 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?

  4. 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.

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