Fig. 1

Main stopovers used by six European nightjars during migration. Colored circles are light-level-based geolocation stopover positions estimated using breeding site calibration. Positions are means of high-quality latitude and longitude estimates (see “Methods” section) during the full length of the stopovers. For stopovers latitudes during Equinox, intervals assuming realistic migration speeds (dotted lines correspond to speeds of 200–500 km/day; squares correspond to 350 km/day) rather than positions are indicated