Each autumn, millions of songbirds disappear into the sky on journeys that human eyes could never fully follow — until now. Researchers have fitted the smallest of these migrants with featherweight tracking devices, and the paths revealed are neither straight nor simple, but winding, deliberate, and dependent on a fragile chain of habitats stretching across continents. The discovery reframes migration not as a single act of flight, but as a series of carefully chosen resting places, each one as vital as the destination itself. In learning where these birds truly go, we are also learning what w