No apparent gain from continuing migration for more than 3000 kilometres : willow warblers breeding in Denmark winter across the entire northern Savannah as revealed by geolocators
BACKGROUND: For most Afro-Palearctic migrants, particularly small songbirds, spatiotemporal migration schedules and migratory connectivity remain poorly understood. We mapped migration from breeding through winter of one of the smallest Afro-Palearctic migrants, the willow warbler Phylloscopus trochilus, using geolocators (n = 15).RESULTS: Birds migrated from North European breeding grounds to Wes
