Mammals Go Nocturnal

(Originally aired July 18, 2018) Guest: Justin Brashares, Professor and G.R. & W.M. Goertz Chair in the Department of Environmental, Science, Policy, and Management at UC Berkeley It wasn’t until the dinosaurs died out some 65 million years ago that scientists believe the Earth’s smaller, furry creatures started feeling bold enough to venture out during daylight hours. They’d been nocturnal while the dinosaurs roamed. Now, it seems we humans are having a similar effect: our presence is driving mammals back into the cover of night.