Fig. 1
From: High individual repeatability of the migratory behaviour of a long-distance migratory seabird
Migration routes and wintering areas of 64 common terns tracked with a light-level geolocator. Wintering areas are based on the individuals’ locations (estimated using FLightR) at daily twilights from one week after the estimated arrival up to one week before the estimated departure from the wintering area. For the birds of which the geolocator stopped working at the wintering area, data were used until the last estimated position. The heatmaps of the twilight positions were produced in QGIS using quartic kernel density with a 2º radius