They survived extinction level events and record high global temperatures - how did mammals adapt and thrive in a dramatically changing world? In today's episode, Tristan welcomes back Professor Steve Brusatte to uncover the origins of mammals. Going back to a time before the dinosaurs, from lizard-like creatures to wooly mammoths, Steve helps us understand how so much is known about life 300 million years ago.

For more Ancients content, subscribe to our Ancients newsletter here. If you'd like to learn even more, we have hundreds of history documentaries, ad free podcasts and audiobooks at History Hit - subscribe today! To download, go to Android or Apple store.