In 2023, Rebecca Heisman (@r_heisman) will publish her book Flight Paths: a deep dive into the science behind the techniques scientists use to study bird migration, and the stories of the people who developed them. In the meantime, Heisman offers a bit of a preview via this piece she wrote for Audubon Magazine, which offers some of the milestones in this history. Photo of bird banding, a key tool in migration studies, by Yellowstone National Park (public domain)