Mammals, the furry, milk-giving group to which humans also belong, can trace their origins back to the Mesozoic. Fossils from the Isle of Skye in Scotland in particular, are providing new insights, revealing how their evolution alongside the dinosaurs set the foundations of their survival and success after the mass extinction 66 million years ago. In this talk, we will find out about fieldwork in Skye uncovering exceptionally preserved fossils, and the new analytical techniques revealing how mammals lived, grew, and flourished in the Jurassic.