Northern populations in Europe and west Asia are migratory. Southward migration is August–November, and appears to occur at a rather leisurely pace. Birds move in a broad front across Europe, the Middle East and the Sahara. Return migration is in February and March to as late as May. Migration appears to be along a broad front in that migrating birds are seen widely throughout the Mediterranean and its islands. Migration in both seasons crosses the Sahara.
Widespread post-breeding dispersal of juveniles begins in July continuing until migration. Spring migration leads to frequent overshoots. So, outlying dispersal records are common. Dispersal records include Iceland, Britain (Moon 1997, Greason 1998), Belgium, Luxembourg, Netherlands, Denmark, Germany, Sweden, Finland, Austria, Poland, west central Asia, Azores, Madeira, the Canary and Cape Verde Islands, and Brazil (Fernando de Noronha island) (Nacinovic and Teixeira 1989). In the Indian Ocean, there are dispersal records from the Comores and Mauritus, undoubtedly from Madagascar.
