Beneath layers of rock art are drawings of animals SO strange that, for a long time, some anthropologists thought they could only have been imagined. But what if these animals really had existed, after all?

Thanks to the Gundjeihmi Aboriginal Corporation, Professor Bruno David, Monash University, and David Morgan-Mar (https://dmm.photo) for providing photographs for this episode!

And thanks to Ceri Thomas (https://nixillustration.com), Nobu Tamura (http://spinops.blogspot.com/), Dmitry Bogdanov, and Roman Uchytel for allowing us to use their wonderful paleoart in this episode.