This file contains the GPS-tracking data of Montagu’s Harriers used for analyses on daily and total flight distances and contains the following columns: season (name of the bird, years), population (France, Netherlands, Denmark), sex, date_time (date and time in UTC), ann.rough (annotation of annual cycle phases: breeding, autumn migration, winter, spring migration), latitude, longitude, speed_2d (instantaneous speed measured by the GPS-device)