Mammal Evolution

For most of us, the story of mammal evolution starts after the asteroid impact that killed the dinosaurs, but over the last 20 years, scientists have uncovered new fossils and used new technologies that have upended this story. In Beasts Before Us, paleontologist Elsa Panciroli charts the emergence of the mammal lineage, Synapsida, beginning at their murky split from the reptiles in the Carboniferous period, over 300 million years ago. They made the world theirs long before the rise of dinosaurs.

A list of the attributes that define a mammal is a ragbag of things - fur, live birth, three bones in the middle ear, a brain whose two halves are robustly joined together.... But this curious collection of features contain the roots of all the biology that makes us what we are: monkeys with massive brains who parent extensively, enjoy sport and think lots. Which is to say, what makes us mammals makes us human.