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The marine reptiles Ichthyosaurs arose after The Great Dying, which wiped out at least 90 percent of life in the oceans, changing the seas forever and triggering a new evolutionary arms race between predator and prey.

Thank you to these paleoartists for allowing us to use their wonderful illustrations:
Julio Lacerda: https://252mya.com/gallery/juliolacerda
Ceri Thomas:   / alphynix  
Dmitry Bogdanov: https://www.deviantart.com/dibgd
Nobu Tamura: https://spinops.blogspot.com/
Franz Anthony: https://252mya.com/gallery/franzanthony
Nikolay Zverkov: https://www.deviantart.com/ngzver

Produced in collaboration with PBS Digital Studios:    / pbsdigitalstudios  

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References:
https://docs.google.com/document/d/1V...